Look, honey, I know this is weird, but its doctor's orders! He said that at your last checkup, he noticed you were...well, very, very large! He wants an erect measurement, so its either me, here at home, or you have to go in and get hard for Dr. Roberts. I know its weird, sweetie, but lets just try and get it over with ok? ...Oh, my. Well, yes, you are big. Bigger than anything I've ever seen. Is this ok, honey? Its not too weird? Yes, absolutely the largest...god, 9"! That's much bigger than your step-father...and honestly, I'm glad you don't take after him in that regard. I'd hate for you to leave your future lovers unsatisfied. Oh, yes, I suppose I did imply that, huh? Hmm...well....it's true. Gosh, you're SO big! The doctor said I'll need to get a sample, too, to measure the volume of your cum. Is that ok, sweetie? Can I stroke it for you? Oh, my breasts? Well, if you think that would help...my god, you're just SO much bigger than your step-father's tiny cock! I can't help myself, I'm sorry...