In the scene the camera/viewer is the boyfriend, and it’s after a party or something, and one girl is sitting on a bed/couch talking to the “boyfriend” about how his girlfriend is really hot and convincing him the 3 of them should have a threesome, but really she just wants to seduce the other girl and turn her into a complete lesbian and has no interest in the boyfriend. After a minute or 2 the other girl (the girlfriend) joins the scene and there’s some chit chat and giggling and the girl slowly seduces the girlfriend with some light touches, then kissing, then things progress until they’re having lesbian sex in front of the boyfriend