...; "My little baby sister has my pee-pee in her mouth!"
The notion set his mind and body on fire as he considered it, and Bart's hips began to pulsate. The convulsing spread through his frame like an earthquake. He began to think about all the so-called 'naughty' names that he also called his pee-pee.
The muscles in his pudgy stomach were beginning to tense, and the muscles in his chubby thighs and puffy buttcheeks were beginning to twitch, white hot, as if about to cramp, and so Bart began to push his bottom forward, almost like he was feeding his pee-pee to his infant sister.
"Eat my wiener! Eat my wiener, Maggie!" Bart blurted desperately, imagining his penis to be a hot dog in her mouth as he felt the muscles in his immature penis pull his head to his sister's lips, then fire it to the back of her mouth as he shot blank after blank in a fantastic dry orgasm.
"Oh, wow man!" he gasped as he panted breathlessly, his mind reeling from the new feelings he was getting from between his legs as Maggie continued to suck him. He could feel his limp penis being stretched by the motion of his sister's mouth and he marvelled at it.
The phone rang, and Bart quickly pulled Maggie from her new toy to answer it. It was Milhouse.
"Hey, Bart, ya wanna go play video games down at the mall?" he asked.
"Not today, Milhouse. I gotta babys...