Please Help me Find A Hentai!

It's a hentai about a guy and girl (lets say Hank and Susan) who have a crush on another guy and girl. Their crushes end up going out with each other, so Hank and Susan start having sex, to feel better about their unrequited love. The story goes on for a while, until eventually their crushes break up and they start going out for real.

I think Susan has glasses

I'm not sure, to be honest. I actually dont know the diff between a doujin and a hentai, but I don't remember it having an animationi(but if it does I'll check that out!).

I just remember it being a decent sized story. Hank and Susan have crushes who get together, Hank and Susan have sex for a while, then when Hank and Susan's crushes break up Susan's crush approaches her to hit on her. She asks him if he'd do something sexually with her and he gets taken by surprise... Then she realizes Hank is the guy she really wants to be with, and they get together for real.

Something like that.

Maybe? Not too sure. I can't remmeber any details past the ones I just posted =(