Megan moaned as she felt his cock entering her anus, not experiencing an ounce of pain like you might expect. Being a shape shifter lets your body adapt to anything you want, but it wasn’t just that that had her crying out lustfully. Robin had fucked her ass before, but now her rump had hundreds of pounds of fat on it, and to Megan, this felt so much better to feel this hot man meat shove into her heavy and doughy ass. Her butt still tingled from her massive fart, making her conclude that everything felt different now that she was the size of a baby whale. Besides, only fart girls could produce gas that stinky.

Robin was enjoying this even more, groaning as he buried himself to the hilt. With his cock deep within the ass of this innocent girl, he pulled his arms out of her butt crack and them around the buns, still keeping himself completely wrapped in ass fat. With his body within the fat and smelly crevice, he pulled himself back and felt Megan squirm as he did, her booty jiggling around him and making the Boy Wonder plunge right back in as his wang throbbed.

“Oh wow.” Megan gasped, not expecting that feel so good. Robin thrust back again and then in even harder than before, each of his thrusts making the butt jiggle even more. The boulder-like buns heaved and bounced up lightly as they jiggled, but he still held on type, digging his nails into the fat to hold on. Megan yelped while Robin groaned perversely as the cheeks grinded up and down on his body all while he reamed that ass.

Megan made cute noises every time either Robin’s dick moved or her ass did on its own. Feeling that hot meat spearing into her bowels made everything up to her belly jiggle as it rattled her bowels. Her fat ass squeezed down on it, Megan trying her best to focus and have her butt massage Robin just as her throat had, especially since it made her so wet do so. On top of that, just feeling her heavy butt slabs smash and grind into Robin made her dig her nails into the mattress. She hadn’t counted all this fat feeling so incredible to her, but pleasing Robin’s cock with the inside of her fat booty was easily the best part, just like what Megan would have said.

“Such a fat ass.” Robin grunted, yanking himself back until he was only in up to his head. Miss Martian moaned loudly as she felt so much leave her all at once, but not nearly as much as when it all came back. The heavy girl let out a throaty grunt as Robin used every muscle in his crotch and ass to make Miss Martian’s quiver around his as he gave her long and hard strokes from now on. Now the butt cheeks were relaxing into their round and squishy form as he pulled back, but when he thrust back in, the buns clenched tightly with dimples even forming in them as they pushed the Boy Wonder along as well.

The meaty ass halves hugged all of him while Robin began to feel like even the bowels were sucking him forward. Robin grunted with a smile on his face with every thrust, wanting never to leave this warm and soft place. His dick ground into Megan’s hot insides while his balls just smacked into more flab. He could feel warm cum dripping down onto his legs as he listened to the Martian Girl’s lustful cries as she hung her head and took it. Music to his ears.

That was when he slammed his palms down hard the butt cheeks, easily getting Megan’s attention. The next thing she knew, her butt was rattled with the same rampant pace that made her believe she was fucking Kid Flash. Robin moved as fast he could, unable to contain himself as he prepared to blow. The sound of flesh hitting fat was heard every second as the ass jiggled around the Boy Wonder.

“UUURRRRRP!” he blinked when he heard that, but never stopped. Looking ahead, he saw Megan with her head held up and many more belches following. Every few seconds she’d let one out, some loud, some quiet, some small, some that rattled the busted bed even more so. Robin was fucking a real fatty and unable to contain himself, he threw his head down and bit her in the butt.

“AAAAUUUUUUUUUUUUUUUUUURRRRRRRRRRRRRRRRRRRRPP!!!!” Megan’s yell quickly turned into another belch and before she could tell Robin not to do that again, she gasped as she felt his seed flood her bowels. Robin howled like a wolf as he unloaded a huge batch into this huge ass, and he heard Megan do the same as she came as well, her cum getting all over his legs and the sheets below, but all hidden under her butt. Megan felt some of Robin’s cum even reach her belly, and had only one thing to say with something from the Boy Wonder going inside her “ *BELCH!!* Mmmmm, yummy.”