Disturbed by an apparent office romance between her superior officer and his administrative assistant and by the favors that accompanied the relationship, the plaintiff, Mary *656Ritchie, a trooper with the Department of State Police (department), objected, first informally and then formally. After learning about the plaintiff’s objection, her superior officer, Lieutenant Richard Lauria, criticized her performance, lowered her evaluations, and threatened her with transfer.
In count one of her nine-count complaint, the plaintiff alleges that she was subjected to a sexually hostile work environment and to retaliatory conduct by the department in violation of G. L. c. 15IB.1 A Superior Court judge allowed the department’s motion for judgment on the pleadings as to count one.2 The judge determined that the misconduct alleged did not rise to the level of either a hostile work environment or retaliation in violation of G. L. c. 151B. Another Superior Court judge entered separate and final judgment pursuant to Mass.R.Civ.P. 54(b), 365 Mass. 820 (1974), on this count, which was the sole count against the department; the plaintiff appealed. We reverse the judgment as we conclude that the factual allegations of office romance, favoritism, and reprisals alleged here are sufficient to state a G. L. c. 15 IB claim, at least for retaliation.
The facts alleged by the plaintiff are as follows. The plaintiff has been employed as a trooper by the department since June 13, 1988. Since July 1992, she has worked in the department’s crime scene services section (CSSS). Lieutenant Richard Lauria was the superior officer from the time the plaintiff joined CSSS until November 1, 1999, when he was transferred. Joanne Na-son was Lauria’s assistant and a civilian employee of the department. Sergeant Deborah Rebeiro was the plaintiff’s direct supervisor.
The plaintiff contends that Lauria and Nason spent time in the office kitchen together, played “footsie,” held hands, gave each other shoulder massages, played romantic music in their *657shared office, and departed from work together.3 The plaintiff states that in “attempting to avoid the hostile work environment, [she] limited her contacts with Joanne Nason.” She also changed her work hours to avoid being “alone in the office” with Lauria and Nason.
In August, 1998, Lauria requested that all CSSS troopers contribute a portion of their retroactive pay increases to fund a bonus for Nason and another civilian employee. After the plaintiff objected to the idea, Lauria reportedly made “disparaging remarks” about her. The record does not indicate what those remarks were. The plaintiff also alleges that Lauria “interrogated” her to determine what she told other troopers about Lamia’s bonus proposal.
In December, 1998, when the plaintiff was nine months pregnant and had been removed from the call list, Lauria asked her to respond to a call. After the plaintiff refused to respond to the call due to her condition, Rebeiro instructed her to apologize to Lamia.
On July 7, 1999, the plaintiff learned that Nason told another trooper that Nason believed the plaintiff disliked her. The plaintiff then informed Rebeiro that she feared retaliation from Nason and Lauria. Two days later, on July 9, the plaintiff reported to work although she was “physically ill.” The CSSS homicide liaison called for assistance with an investigation. The liaison asked the plaintiff to call other troopers who were not on duty to see if they could assist. The plaintiff was unable to find anyone willing to work and eventually went home because she was sick.
On July 12, Lauria issued the plaintiff an “Observation Report” for disobeying an order, apparently for failing to find investigative assistance on July 9. In the report, Lamia wrote “[t]his is not the first instance where I asked you to assist other CSS[S] personnel and you refused to do so. I have acquiesced *658to you in the past but this time it was a direct order to perform a lawful function while on duty. . . . Your refusing to utilize your training and expertise to assist other CSSS officers in processing this terrible crime is very disturbing to me.” The report warned that “any future disobedience of a direct order” would result in the plaintiff being asked to leave the CSSS. The plaintiff alleges that the report was not issued according to department protocol: proper procedure requires that the plaintiff’s direct supervisor, Sergeant Rebeiro, issue such a report.
Later that month, the plaintiff spoke with a union representative about her concern that she was subject to a hostile work environment. Subsequently, the plaintiff filed a sexual harassment complaint against Lauria and Nason with the “Harassment/ Discrimination Unit” of the department on July 27, 1999. After filing the complaint, the plaintiff received the results of her most recent evaluation.4 Although she received no negative scores, she received lower scores than she ever previously had in some categories. The plaintiff alleges that these lower scores were causally related to her filing a complaint. The plaintiff appealed her adverse scores, which appeal was later denied.
Lauria and Nason were transferred from the CSSS in early November, 1999. A short time later, on December 6, 1999, Captain Philip A. Trapasso of the harassment/discrimination unit found that the relationship between Lauria and Nason had created a hostile work environment that constituted harassment. His summary report, which was attached as an exhibit to the complaint, stated: “[f]olio wing a thorough investigation . . . the complaint of harassment is sustained, the relationship between Det. Lt. Lauria and administrative assistant Joanne Na-son, created a hostile work environment for you and others. . . . [Mjisuse of the Employee Evaluation System, Observation Report has also caused you a hostile work environment. Additionally Det. Lt. Lauria has been found to have shown favoritism toward Joanne Nason through overtime, time off and reprisals against other employees of Crime Scene Services.”
*659In his summary report, Trapasso stated that his conclusions were based on fourteen interviews, records of alphanumeric page messages, e-mail messages, attendance records, and the daily administrative journal. The summary also indicated that a “complete report” had been prepared and forwarded to the Superintendent of the department. None of these documents is included in the record appendix.5
The plaintiff filed a complaint with the Massachusetts Commission Against Discrimination (MCAD) on January 3, 2000. She then removed her case to Superior Court on October 5, 2000. On April 9, 2001, the department filed a motion for judgment on the pleadings pursuant to Mass.R.Civ.P. 12(c), 365 Mass. 754 (1974), on the grounds that the plaintiff’s allegations failed to state a claim of sexual harassment within the meaning of G. L. c. 151B, § 1(18), or of retaliation pursuant to G. L. c. 151B, § 4(4). The motion was allowed, after hearing, on July 30, 2001.
Discussion. 1. Standard of review. Rule 12(c) of the Massachusetts Rules of Civil Procedure provides that “[ajfter the pleadings are closed but within such time as not to delay the trial, any party may move for judgment on the pleadings.” “A defendant’s rule 12(c) motion is ‘actually a motion to dismiss . . . [that] argues that the complaint fails to state a claim upon which relief can be granted.’ ” Jarosz v. Palmer, 436 Mass. 526, 529 (2002), quoting from Smith & Zobel, Rules Practice § 12.16 (1974).
In reviewing the grant of a rule 12 dismissal, we examine the “complaint to determine if, viewing its allegations and inferences broadly and in the plaintiff’s favor, ‘it appears beyond doubt that the plaintiff can prove no set of facts in support of [her] claim’ entitling her to relief.” Hobson v. McLean Hosp. Corp., 402 Mass. 413, 415 (1988), quoting from Nader v. Citron, 372 Mass. 96, 98 (1977). In considering the defendant’s 12(c) motion, “all of the well pleaded factual allegations in the adversary’s pleadings are assumed to be true and all contravening assertions in the movant’s pleadings are taken to be false.” *660Minaya v. Massachusetts Credit Union Share Ins. Corp., 392 Mass. 904, 905 (1984), quoting from Wright & Miller, Federal Practice and Procedure § 1368, at 691 (1969). See Jarosz v. Palmer, 436 Mass. at 529-530; Tanner v. Board of Appeals of Belmont, 27 Mass. App. Ct. 1181, 1182 (1989); S & H Petroleum Corp. v. Register of Deeds for the County of Bristol, 46 Mass. App. Ct. 535, 536 (1999).
2. Hostile work environment claim. General Laws c. 15IB, § 1(18), as appearing in St. 1987, c. 473, § 2, defines the hostile work environment variety of sexual harassment as “sexual advances, requests for sexual favors, and other verbal or physical conduct of a sexual nature when ...(b) such advances, requests or conduct have the purpose or effect of unreasonably interfering with an individual’s work performance by creating an intimidating, hostile, humiliating or sexually offensive work environment.” See College-Town, Div. of Interco, Inc. v. Massachusetts Commn. Against Discrimination, 400 Mass. 156, 162 (1987).6,7 The court has defined this environment as one “pervaded by harassment or abuse, with the resulting intimidation, humiliation, and stigmatization [that] poses a formidable barrier to the full participation of an individual in the workplace.” Cuddyer v. Stop & Shop Supermarket Co., 434 Mass. 521, 532 (2001) quoting from College-Town, Div. of Interco, Inc., supra at 162.8
In the instant case, in contrast to the other Massachusetts *661decisions involving hostile work environment claims, there were no allegations of any sexual advances, requests, or conduct directed at the plaintiff. See, e.g., College-Town, Div. of Interco, Inc., supra at 158-159; Cuddyer v. Stop & Shop Supermarket Co., supra at 523 (plaintiff subject to “verbal and physical sexual conduct” by supervisor from outset of employment). In regard to the sexual behavior, the plaintiff was a third party whose exposure was limited to observing the conduct and being questioned about her objections to the relationship and associated favoritism. Compare Leibovitz v. New York City Transit Authy., 252 F.3d 179, 190 (2d Cir. 2001) (although “evidence of harassment directed at other co-workers can be relevant to an employee’s own claim of hostile work environment,” plaintiff failed to demonstrate that harassment of other women affected the terms and conditions of her employment); Lindemann & Grossman, Employment Discrimination Law 834-835 (3d ed. 1996). Also, the “sexual” conduct described — hand holding, playing “footsie” and shoulder massages — was confined to a single, consensual office romance (if such it was); there was no allegation that other supervisors were involved in similar office romances. The work unit, however, appears to be relatively small, as the plaintiff expressed concerns about being “alone” with Nason and Lauria. We also cannot determine the frequency of the conduct or the plaintiff’s exposure to it from the pleadings.9
The alleged favoritism toward Nason raises another set of considerations.10 That favoritism included the bonus request, overtime, time off, and “reprisals” against other employees.11 The role that favoritism toward an office paramour plays in a hostile work environment case is not an issue that has been *662explored in Massachusetts case law. Although there may be cases where the facts and circumstances of the favoritism and the office paramour’s conduct rise to the level of creating a sexually hostile environment,12 it is also true that “[a] sexual relationship between a supervisor and a co-employee could adversely affect the workplace without creating a hostile sexual environment. A supervisor could show favoritism that, although unfair and unprofessional, would not necessarily instill the workplace with oppressive sexual accentuation.” Drinkwater v. Union Carbide Corp., 904 F.2d 853, 862 (3d Cir. 1990).13
In the instant case, the allegations set forth in the plaintiff’s complaint appear too thin to establish that she was exposed to an atmosphere so “sexually charged” that it would have interfered with her “work performance by creating an intimidating, hostile, humiliating or sexually offensive work environment.” G. L. c. 151B, § 1(18)(6). See Drinkwater v. Union Carbide Corp., supra at 862; MCAD Sexual Harassment in the Workplace Guidelines II.C (2002) (MCAD Guidelines). *663These allegations are, however, buttressed by the harassment/ discrimination unit’s summary report attached as an exhibit to the complaint and referenced therein. The summary report was based on an extensive investigation and concluded that a hostile environment had been created. The report and the unproduced referenced materials raise concerns that, despite the sketchiness of the allegations, more support for the hostile work environment claim may be forthcoming.
Given the novel and fact-specific nature of the claim, however, there remains a substantial question whether the favoritism and office romance at the core of these allegations, even broadly construed, are enough to establish a hostile environment claim. Nonetheless, we need not resolve the hostile environment claim to determine whether the motion should have been allowed, as the plaintiff’s allegations in count one are sufficient to establish a c. 15 IB retaliation claim, even if they were to fall short on the c. 15 IB hostile work environment claim. Nader v. Citron, 372 Mass. 96, 104-105 (1977).14
3. Retaliation. General Laws c. 15IB, § 4(4), as inserted by St. 1946, c. 368, § 4(4), makes it unlawful “[f]or any person [or] employer ... to discharge, expel or otherwise discriminate against any person because he has opposed any practices forbidden under this chapter or because he has filed a complaint. . . . ” Although the parties have ignored the provision, the Legislature, in 1989, inserted § 4(4A) in c. 15 IB (St. 1989, c. 722, § 14), which makes it unlawful “[fjor any person to coerce, intimidate, threaten, or interfere with another person in the exercise or enjoyment of any right granted or protected by *664this chapter . . . .” See Bain v. Springfield, 424 Mass. 758, 765 (1997); Pontremoli v. Spaulding Rehabilitation Hosp., 51 Mass. App. Ct. 622, 625 (2001).15
The plaintiff’s claim of retaliation may succeed even if her underlying claim of harassment fails. See Bain v. Springfield, supra at 765; Abramian v. President & Fellows of Harvard College, 432 Mass. 107, 121-122 (2000). The plaintiff need only “prove that [she] reasonably and in good faith believed that the [employer] was engaged in wrongful discrimination,” not that the employer actually engaged in wrongful discrimination. Abramian, supra at 121, quoting from Tate v. Department of Mental Health, 419 Mass. 356, 364 (1995). In the instant case, we conclude that the facts alleged are sufficient to satisfy the requirement that the plaintiff “reasonably and in good faith” believed that the employer was engaged in conduct in violation of G. L. c. 15 IB given the office romance and the favoritism toward Nason.
To establish retaliation, the plaintiff must also show that she engaged in legally protected conduct, she suffered an adverse employment action,16 and a causal connection existed between the protected conduct and the adverse action. Pontremoli v. Spaulding Rehabilitation Hosp., supra at 625, quoting from Lewis v. Gillette Co., 22 F.3d 22, 24 (1st Cir. 1994) (“plaintiff must establish the basic fact that he was subjected to an adverse employment action because of his protected activity” [emphasis original]).
The statute specifies that filing a formal complaint of sexual harassment is protected activity. The courts and the MCAD have determined that other conduct also qualifies. See, e.g., Abramian v. President & Fellows of Harvard College, supra at 121. For example, “complaining to management or filing an internal complaint of harassment,” or “meeting with co-workers to discuss how to stop sexual harassment in the workplace,” *665can trigger the protections of c. 151B. MCAD Guidelines IX.A. Here, the plaintiff asserts that she complained about her work environment on multiple occasions. Her first complaint, in August, 1998, related to Lauria’s proposed bonus for Nason. She also complained three times in July, 1999, when she expressed concern to Rebeiro about retaliation from Lauria and Nason, when she met with a union representative about her work environment, and when she filed her formal complaint with the department. These allegations are sufficient to support a claim that the plaintiff was engaged in “protected activity” under the statute.
We also conclude that the plaintiff’s allegations are sufficient to support a claim that she was the subject of adverse employment action as a consequence of her protected activity. Prohibited retaliatory actions are those that constitute a change in working conditions that “create a material disadvantage in the plaintiff’s employment.” Flanagan-Uusitalo v. D.T. Indus., Inc., 190 F. Supp. 2d 105, 116 (D. Mass. 2001). See MacCormack v. Boston Edison Co., 423 Mass. 652, 663-664 (1996) (finding no prohibited retaliation where plaintiff offered no evidence of “disadvantage[] in respect to salary, grade, or other objective terms and conditions of employment”); Bain v. Springfield, supra at 766 (“subjective and intangible impressions” do not make out a case of retaliation).
Here, the plaintiff alleges that the following conduct constituted impermissible retaliation: misuse and improper issuance of an employee observation report, threat of removal from the CSSS,17 misuse of the employee evaluation system, and “retaliation by superior officers” following her filing an internal harassment complaint. We conclude that she has sufficiently alleged adverse employment actions for the purpose of a rule 12(c) motion. See MCAD Guidelines IX.B.
Finally, the allegations and the inferences that can be drawn therefrom are sufficient to establish the plaintiff’s ability to prove that some of these adverse actions were causally related *666to her protected activity. On July 7, 1999, after a year in which the plaintiff had made her opposition to the conduct and favoritism clear,18 the plaintiff learned that Nason told another trooper that she believed the plaintiff disliked her. The plaintiff then informed her direct supervisor that she feared retaliation. Within a week, after a disputed incident, the plaintiff had been issued a written reprimand and a threatened transfer. On July 27, 1999, she filed her formal complaint, and shortly thereafter she received the lower evaluations. “Close temporal proximity between the protected activity and the adverse employment action permits an inference of the causal nexus necessary for a finding of retaliation.” Cooney, Understanding and Preventing Workplace Retaliation, 88 Mass. L. Rev. 3, 13 (2003). See Clockedile v. New Hampshire Dept. of Corrections, 245 F.3d 1, 6-7 (1st Cir. 2001). Without further factual development, it is premature to dismiss the plaintiff’s claim of retaliation.
For the reasons stated above, we reverse the judgment dismissing the G. L. c. 15 IB count against the department.
So ordered.