That's a nice title!
"How did I end up having my boobs played with"? Well, it's only the natural flow of Hentai, really.
I like how he instantly realises she's a virgin, but kinda plays along with her narrative of being 'experienced'. And hey, by that end, she really has become a bit of a 'freak', as he puts it. And hey, nothing wrong with a relationship where she just uses you for your dick...That's probably what you were going for anyway when you hit on her, no?
All women use us for our dicks. You think it's our looks, interests or romance. They want a hard pee pee more. Just sometime they figure we can be cool with each other as long as the stroke game is still right.
Ohhh-Kayyyyy ... seems "beast has been unleashed" in Erika-chan. Granted her first encounter seemed to be rather rough, but that's generally what happens when you lie about your *cough-cough* "status".
At least she seemed to have become comfortable with it by the close.