Yes, though you're sure people aren't supposed to stretch like that.

You let go of her legs, driving all the way to the base in her ass by force as you reach up and pin her hands. Heather looks into your eyes and grins as she realizes you’re about to cum.

“Fill me the fuck up!” she hisses, and you can’t help but moan and start to orgasm inside her wicked asshole. You keep fucking her, needing compulsively to milk out the insane amount of jizz you can produce. She cums with you this time, both of you moaning and panting as you continue to sodomize her even while you shoot white-hot cum into her bowels.

Heather gasps, arching her back as her stomach starts to swell from the sheer volume of your load. It’s subtle at first, but soon she’s filling up like a beach ball. Cum gushes from around your cock as it plunges again and again into the slutty artist’s butt, making her shriek and groan in complete rapture. Your thrusts are furious, almost vengeful, and you will yourself to not stop for anything. For yourself, but also for this wonderful slut offering you her body so she can learn where her limits are. Her eyes roll back and she lets out a beautiful, longing shriek as she’s stretched to capacity while you slam balls-deep into her ass to spurt the last ropes of your cum into her.

Both of you need a lot of panting to catch your breath, but you stay there for a few moments before you have the strength to pull out. Heather’s eyes go blank and she lets out a gurgling, groaning noise as cum floods her sheets. She’s left sitting in a pool of it as her stomach goes back down, shrinking to its original size as her body expels the ridiculous amount of seed you’ve pumped into the poor woman’s wonderful ass.

“GOD!” she finally says with a sharp breath, laughing a little. “Hey, so, whenever you’re bored and want to come see what I’m doing, just fucking chase that instinct!” You lean over her and kiss her, which she responds to weakly, but happily. “I’m going to sleep before I clean up. You can hang out. Or go out and use that thing. I’m not a jealous lady.” She crawls up, mostly out of the sea of your semen, and quickly passes out from exhaustion, leaving you alone again to consider what to do.