manga about school girl who gets a video game console when she played she entered the game world and has to fight other players, later she asked one of her classmates (a boy who she sees playing video games) for help, when he helps her he can control her actions, she won the fight when he helped her, but he wants her to do stuff she is not comfortable with in return. (I think I read it years ago so I don’t really remember but I think he asked (more like blackmailed) her into wearing some kind of cosplay and to let him touch her inappropriately)

Sounds like Heroine wa Zetsubou Shimashita [https://www.mangaupdates.com/series/htttarz/heroine-wa-zetsubou-shimashita]

yes that’s it! thanks for your help