Feel up her butt.

You slide your hands down Doe's back while kissing her passionately. You hands roam onto her buttocks and squeeze them tightly. Then your right hand follows her butt crack in between her legs. Doe shifts about, a little bit tickled. You rub her ass deep between her legs with your right hand, while your left hand settles on her butt cheek. You grasp and release with your right hand, stimulating you cute butt as much as you can through her elastic banded University shorts.

"You have a hot ass", you whisper into Doe's ear. She leans into you leaving you to feel up her ass as much as you like.