Try and talk your way out of this.

"If you don't stop, I'll fall anyway!" you barely manage to cry out in between gasps of pleasure.

She stops, her soft lips still wrapped around the base of your shaft, her eyes look up at you, contemplating for a second. Finally she slowly brings her hands down and around your balls, firmly holding you in place as her head pulls back. Her lips slowly slide up your shaft softly sucking until finally it jerks free from her mouth. One of her hands quickly grabs hold, slowly stroking you.

"And It'd be a pretty nasty fall, too. Not a bad way to go though, I'm sure some guys would love to go cumming. So I guess you have two choices then. Either stay out here and have the best, and LAST, fall of your life... or COME in here, and take your chances with me." Her hand cradling your balls starts to slowly massage them as her other hand quickens it's pace stroking you up and down, gradually faster and faster. She smiles up at you, knowing she has you in the palm of her hand. You don't wanna die, but you can't even think straight. She giggles as you try to stammer out an answer.