She mocks you

"So you like when girls make fun of your micropenis?" says Kat grinning

"Hahahahaha! What a pervert! No wonder you like that, with a penis that small it's the only way you can satisfy a girl!" you can hear her saying while pointing at your crotch

Even if this is very humilliating, being naked in front of such a beautiful woman excites you and you can't help but get fully hard.

"Aww~ Are you completely hard, sweetie? I guess despite it being so tiny and pathetic, I can't help but feel sorry for you. I feel like every girl that may see that will laugh at you, you poor little thing... Maybe I should do something for you..."