Invite him to find out for himself
From Create Your Own Story
Jamie seems so appreciative of your body. Why not let him enjoy himself?
"All of this is for you tonight, baby," you whisper in his ear. "Go ahead, do what you want. Touch me, tear off my clothes, whatever. I'm not her."
This seems to give Jamie a little courage. He doesn't tear off your clothes, but he does finally rest his hands on your hips, then glide them up over your waist and stomach. "Shit...you must work out," he laughs nervously when he feels your tight core muscles. You kiss him again, and when you still haven't made a move to stop his wandering hands, he dares to cup and squeeze your full bosom. You both groan at the same time, and he looks down in amazement as your cleavage shifts under his hands.
"Anything you want," you remind him, and he takes this as permission to slip the straps of your dress over your shoulders. You slowly peel it down until your hefty tits are spilling out. Jamie's eyes are as big as saucers as he gropes you inexpertly. Eventually, he lowers his face into your bust and starts kissing eagerly while you hum encouragement. Your dress gradually finds its way to the floor until you are left in just your straining thong.
Jamie drops his hands down your waist to fondle the edge of your panties, and you wriggle out of them gamely. He's still focused on your boobs, though, so he doesn't see the member hanging pendulously between your legs. Finally, though, his fumbling hands make their way to your crotch, and he pulls back with an expression of confusion. His mouth drops wide open. "Y-you have a..." he stutters.