Allow her to stuff you down her hungry penis

By: That boi

You would much rather not be crushed under your big sister's balls so you relent and allow Kim to gently stick you into the tip of her titanic dick feet-first. "Have fun, little bro!" Kim giggles as a single giant finger slowly pushes you further and further into her slit. The inside of her urethra is so tight and hot, constricting your arms to your sides as Kim squeezes on either side of her cock to push you further down.

Kim's moans of pleasure can be heard from inside her member as you slide down its length. After a good minute you finally fall into your sister's testicle. You land in the hot thick cum with a splat. You try to stand up but you simply slip and fall face-first back into your sister's churning seed. All you can do is simply sit in your bath of cum and try to keep you head above semen as Kim's giant cum factories slowly begin to churn and fill up. You'd never admit it, but you secretly enjoyed the feeling of the hot, thick, sticky liquid slowly rising around your body.

The heat inside Kim's balls makes you start sweating and as you go to wipe your forehead a drop of cum falls from your arm and into your mouth. You cough before actually getting a good taste of the viscous fluid. It was somehow salty and sweet at the same time. You curiously scoop some of Kim's cum into your hand and lick it off. You actually enjoy its taste.

You begin to lie back in the biological sauna and relax as your big sister's cum begins to flow into your open mouth. You actually start to enjoy being in Kim's giant balls as your sister goes about her day, leaving you to soak in her seed until she felt like letting you out...