Classroom Crush [MF] (Cheating/Long)

First time posting on here, sorry for any formatting issues – Characters are me, (6’6, lanky build, brown hair) my girlfriend (description below), and Ashley (ditto)

At the time of this story, my girlfriend (now ex) and I had been dating for a year and a half, and lived together for about six months of that. Our sex life was great in the beginning; I like to give it rough, and she was a more than willing recipient to my, shall we say, ministrations. She was a cute 5’3 brunette, with a pair of the biggest fits I’ve ever seen in person adorning her chest, over a flat stomach and decent, if not outstanding ass; overall she had a good body, but her tits were by far her standout feature, and I loved nothing more than to suck and maul them during our lovemaking/wild fucking sessions. Over time though, the spark faded, as it unfortunately sometimes does, and by the time we hit the one-year mark we had dwindled down to having sex once, maybe twice a week.

Enter Ashley.