Ron finds out who he had sex with

Ron woke up. He had just had a fabulous dream. He had dreamt that he had had sex with Harriet Lorrington, a cute blonde haired girl from Ravenclaw. As he woke up he realized that someone was lying on top of him. He looked down and saw a tuft of red hair lying on his chest. He also felt himself inside of whomever it was that was on top of him. He reached down and grabbed both asscheeks of his mysterious lover.

They felt almost boyish in his hands. He must have slept with a young girl, but who was it? Ron pulled withdrew his penis from his partner and rolled her over. She fell onto the floor next to him with a thud and a whimper. Ron looked down at his body. His penis was still fully erect and there was semen covering his crotch and his stomach. Gingerly, he wiped himself off as best as he could and swung his legs over the bed. Ron was about to scream but covered his mouth with his hands. The person lying on the ground couldn't be who he thought she was. No... this could not have happened. It looked like... his sister, Ginny.