Ashley isn't some random person, she's one of the player's love interests. Someone he is trying to have sex with, and has previously had sexual encounters with. Sleep sex is actually something some couples love to do. It is this fantasy of waking up to sex that I wanted to appeal to. She's also the smallest and weakest character in the entire game, so don't pretend like the player character couldn't have stopped it haha.
I mean, if this is rape, so are all of the "help me big bro I'm stuck in a washing machine" vids on pornhub.
You were not forced to waive her rent. The player character chose to waive her rent, because she would be homeless otherwise. The player character loves ashley, which is why they have sex. You are not the player character.