Show her how sexy her breasts can be. Cum for her!

You reach down and put your hands over her soft, cool hands. Fortunately, her nipples aren't covered, so you're able to play with them. You roll and flick them with your thumbs as you grind harder against her. Now she's starting to flush, both in her face and in her upper chest.

You moan, "fuck," and reach around behind her with one hand, putting your hand on her back to brace her as you grind harder against her. Your other hand keeps squeezing her breast and nipple. "Fuck!"

You feel Diana step beside you, and place a supportive hand on your low back as you fuck her student's breasts. "Language, Joe," she whispers in your ear.

"Sorry," you grunt, then you try to enunciate as you talk to Grace and the class, "So...as you can see...oh shit...being able to touch Grace's breast with my hand, and my penis, as....extremely arousing, and...I'm about to orgasm, if that's ok with Grace."

"Sure," Grace says, adjusting her breasts to maintain their secure hold around your cock. As she brings them closer together, her thumb happens to land right where your cock-head keeps popping out of her cleavage. You feel a little extra jolt of pleasure as your tip brushes against her thumb. You moan and she notices, and starts flicking you with her thumb every time you pop out. You can feel you're only seconds away. "Why wouldn't I be ok with that? It's class, time for learning."

"Well," you moan out, "I'm going to ejactulate a huge load of semen all over your tits, and if you don't want that- oh fuck,- you should put me in your mouth or somethi--- Oh SHIT!"

You're past the point of no return, and begin thrusting rapidly as the pressure builds into white ecstasy.