She has you now!

Kary has you pinned to the ground! There is no way to escape the cum surging into you. Not that you want to get away anyways. Your belly lifts you both off the ground with the pressure, but only so much before you fill out around you like a water bed. Your nude sister’s breasts fall over your shoulders as she slides up a little, as she finishes up, stretching your butthole downwards.

“So, brother, should we keep me this big? In the balls area?” Kary whispers in your ear.

“I’m so full of cum! But I’ve lost my taut round belly! Why is that? Can you fix it?”