u/DisastrousAvocado897

At the start it's abt a boy and a girl dating in what I think was high school and one day a monster attack and the girl gains powers from a guy (I think his hair was white) but she can only use the powers by doing intimate acts with this guy cheating one her boyfriend. There is one scene I remember where she is with the guys saying "sorry (boyfriends name)* multiple times I'm not rlly sure if it's a hentai tho