Over the next few days, Lisa's mind toyed with the idea of having Mark fuck her, without letting her boyfriend know about it. What could she do, to get Mark to do her, and yet, not have it feel like she was cheating on David? She knew that Mark would be all over her, the "casual" mention of a three-way by David had not gone unnoticed, she knew who had originally brought up that question.
After a couple of days of running it over in her mind, she had it. She thought carefully about it, yes, that would satisfy both her lustful desire and yet, in her mind, make it less like cheating. David had to go out of town for the weekend. Her Aunt and Uncle, although they liked David, would not allow an unmarried 18-year-old girl to go out of town with her 18-year-old boyfriend. Lisa set Friday night at the time, she could make the move on Mark then.
Her body was feeling the surge, her 12th-grade classes on Friday just seemed to drag on.
*****
Mark was horny as hell that Friday morning. He'd awakened late, and hadn't been able to enjoy his morning stroke session. He could feel the cum filled balls, his cock aching for the usual morning "happy ending." His second morning period was a spare, thank god, he'd duck into the restroom, and stroke it out there.
Heading down the back stairwell to his locker, he bumped into one of the school's bookworms, Sarah Masterson. He'd noticed her in just a passing manner, straight hair parted in the middle, big glasses, a plain face that you wouldn't remember, a real school nerd look. He stepped back a pace, was getting set to mumble a quick pardon me, then he felt her hand reach down, and caress the bulge of his cock through his jeans. He was momentarily struck dumb, but his cock did all the talking, iron-hard, his balls full, needing release.
"I may be a nerd, but I know how to fuck. Wanna find out right now, big boy? I'll give you the best fuck you ever had if you can keep your mouth shut about it."
He'd looked into her face, the big glasses were gone, replaced with contact lenses. Her hair had been styled into a bob, instead of just straight and long, it really suited her face. Seeing the changes, and the hungry lust in her eyes, the face fired up with a glow of passion, all of a sudden, she didn't look so unremarkable. He'd nodded, and she led him into the school auditorium, up on the stage, and behind the curtains.
There was a pile of gym mats against the back wall, she led him over and stripped naked while he watched. Mark noticed how nice she was put together. Orange-sized boobs, a nice curvy waist, a sparse, wispy bush of pubic hair the same chestnut color as her head, and long, shapely legs. She quickly stripped Mark and pushed him gently back onto the mats.
"I love riding, just like a cowgirl, let me mount up, and ride your nice, big cock!"
Mark stretched out, and enjoyed the view of her swinging into position, ready to mount him. She squatted over him, her hands around his cock, sliding her pussy lips slowly up and down his length, his cock felt like an iron bar. She moved up a little further, and Mark felt her lining up the head of his prick with the soft, buttery folds of her pussy.
