In her dream, her hand kept being batted away and she couldn't bring herself off. Couldn't keep her fingers between her soaking folds long enough, and her real hand between her legs searched weakly.
This was going no where, Mona's dream self thought, and then the dream shifted and Alex was gone. Suddenly she was naked in the Weasley house, looking for him but couldn't find him. Mona's dream self looked down and saw that she wasn't wearing any clothes and she grabbed a sofa cushion to cover herself.
Mr. & Mrs. Weasley appeared and began to yell at her. Told her she was a poor influence on their son and Mona began to cry in her dream, wanting to cover up but they wouldn't let her.
In bed, her hand had stopped and she curled over into herself - a small whimper escaping her as the good dream turned into a nightmare.