This takes place during Harry Potter and the Order of the Phoenix:
Fred entered the common room. No one was in there, good, wait, one person was in there, Hermione. Fred had always thought Hermione was hot. He longed to put his hands through that bushy hair...
Hermione turned around and saw Fred coming in. It was 1am. She had always liked Fred more than George; she thought Fred was sexier, more muscular. She longed for him.
"Where have you been?" asked Hermione, Fred couldn't lie to her. He explained his plan of leaving the castle with George tomorrow to make Umbridges life a living hell. "No, you can't Fred!" said Hermione before she could stop herself. "Why can't I?" He asked questioningly, "because I'd miss you, and I don't want you going away."
Fred's heart started pumping faster, she would miss him? She wanted him to stay? Fred moved closer to where Hermione was sitting, and before he knew it, they were kissing passionately, Fred moved his arms up and down her sides, revelling in her shape, and he could feel a lot of blood going downwards.
Hermione couldn't believe it, she was kissing Fred! She felt his hardness and came to a decision. "Fred, if you're leaving tomorrow, don't leave me as a girl, leave me as a woman. Take me Fred." Fred was dumbstruck; Hermione wanted him to take her virginity now!
He mumbled that he didn't have any protection, "I can use a spell". Fred said "You really want this?" She nodded. He said "come with me"; he took her to the room of requirement. When they got inside, there was a huge bed, candles burning, all very romantic.
Hermione got out a wand, said something and all their clothes went of their bodies in an instant and ended up in a pile near the bed. The two of them nervously looked at one another, looking at their bodies.
Hermione looked at Fred. He was tanned, his chest freckly, his treasure trail, a reddish brown, and his cock, rock hard, about 7.5inches, cut and aching to be in her. Fred looked at Hermione's pure white body, like untouched snow; it turned him on to think that he would be the one to touch it and to dirty it. Her breasts erect and beautiful, her shaved pussy, wet and ready.
Hermione cast a spell on her self, a contraceptive spell she explained to Fred. She lay down on the bed, opened her legs, and winked at Fred. Fred decided to fuck with foreplay and he thrust into her as soon as he touched the bed.
He loved the tightness of her, enclosing around his thick cock, she moaned loudly, amazed at the feel of his aching enormous cock in her. She started scraping at his nipples, pulling on his chest hair, he moaned her name. He bucked into her harder and faster.
They kissed passionately as he thrust into her. Fred started pinching her breasts, sucking them, as he thrust into her more and more. He then moved his hands down and pinched her clit, pinched and massaged it, earning a scream form her. After a couple of minutes of screaming each other's names, and grunting, Hermione orgasmed, sending waves upon waves out, this hit against Fred's cock and he cummed,spilling his seed into her more around two minutes, he hadn't had sex in months, he was glad though, it was the best orgasm he had ever had.
They kissed softly and passionately. The dressed and went back to the tower, where they kissed softly again and went to their respective beds.
Hermione, no longer a virgin, thanking that they had done it. She was already wondering who should be number two...