Well, yaoi books had their share of masturbation scenes. And while most were glamorized, a few got their hotness from how down-to-earth they were. She'd picked up a few pointers.

"You've seen me play games. I like precision." She smiled at him, a plain smile like she'd said that across the dinner table, not while giving him a handjob with the other between her own thighs. Slow and steady, she kept working him.

"...thirteen, fourteen, fifteen!" She stopped, letting him catch a breath. "Well done. You're not going to need those now." Saying no more, she leaned toward him, opening her mouth and resting the tip of his cock on her lower lip. Not sucking him, not even licking, just making it obvious where the mess would neatly go as she started pumping him again.