Ai is an avid cosplayer! So one fine day, she went to the cosplay shop to..... go for shopping?
There the storekeeper took an interest in her, and started to grope her. She'd find it uncomfortable, but not outright wrong.
Soon she warms up to the touches and allowed herself to be touched and groped further.
The storekeeper took it as a signal that she is okay with being fucked.
So fucked they did.