Take back control...

Beth was suddenly seized by an impulse, standing up from Seth's lap to hoist herself back onto the desk. "Not so fast, buddy..."
"I don't know...I kind of liked the speed we were going..." Seth's voice was breathy and full of hunger, and he tried to move his chair closer before Beth put her foot in his crotch.
"Stay there, bad boy." She rubbed his clothed cock with her socked foot, feeling the ridge of his glans cleanly through his pants. She leaned back on her palms, planting her heels wide on the desk to spread her legs, giving Seth an excellent view of her crotch as she began to rub her stomach with one hand and lift her ass off the desk in little pumps in time with the music.
"Jesus...you've done this sort of thing before, haven't you?"
"In college...and a little bit after..." Beth slid her fingers into her panties, plunging them into her surprisingly wet pussy as she maintained eye contact with Seth. If I play my cards right, I can get what I need with minimal commitment....if that's what I want...She was a little worried that she wasn't sure.
As the song reached a crescendo, Beth lifted both legs straight in the air and leaned back, careful not to go tipping ass over tea kettle onto the floor. With her hips off the desk, she split her legs wide, then pulled them back to straight up in the air. Her hands slipped her panties up over her ass cheeks, and she righted herself to let them slip down to her ankles before extending one leg towards Seth, panties dangling from her foot. Seth snatched them off her leg, putting them to his nose and rolling his eyes. Jeez, what a perv.

Beth leaned back, spreading her legs and showing off her pussy for Seth to ogle. "There...now you've seen everything... do we have a deal?"
Seth was enraptured, but not so much that he didn't give her a knowing smile. "Well, there is just one..." he leaned back, rubbing his prominent bulge, "...little problem. Or, one big problem I should say." He popped the button on his pants, shamelessly lowering the zipper until she could see the dark cotton of his boxer briefs straining to contain his cock. "I think you need to do something about it."
Beth was torn between annoyance at how typical Seth was to lead things to this, and a genuine, horny desire to see what he was packing.