Cum in your pants while Susan gives you a lapdance

You can't take it anymore. You look at Susan's bouncing ass and imagine how it would feel to just slide your penis beetween her asscheecks and enter her. In the meantime she is riding you more and more vigorously.

"John, it feels so good!"

You empty your load in your boxers while your ten eighteen-year-old friends watch you cum.
"Girls, he is cuming in his pants." Lisa notices.
"Oh, what a shame..." Sarah sighs.

That was a great day. You just regret that it ended so fast...