Offer to break out the tape measure
From Create Your Own Story
Dylan is still staring at your dick, so you stand up, giving it a few strokes.
"You want to see just how big it is?"
Dylan nods, so you start looking around.
"Do you have a tape measure or something?"
He runs out of the room, and you hear him banging around, tearing through junk drawers. When he comes back, his cock is still full and long, his balls still swinging, but his smile is bigger than you've ever seen it before. He waves a tape measure in the air, and you grab your cock, sticking it straight out.
He presses the end of the tape into your balls, and you let your shaft come down, right at the 10-inch mark. He breathes out a sigh of wonder.
"Fuck, dude, you're hung like a rhino."
What do you do?