Rape is still rape. If the MC says no after they reach the scene, its still fucked up that they can't leave the room.
The thing is , the character is more in a "Ok if I can fuck you later" mood. He doesn't want to get pegged, for sure, but he'll do it to bang her later.
If he really wanted to get out of this room, do you think he wouldn't be able to overpower her ?
The player may want to get out. The character wants to stay in.
If you dislike that, you should choose another path.