Well, duh.

The sight of her bit-titted bitch of a brother moaning and writhing in pleasure before her made both of Sarah's cocks rock-hard within seconds. Adam was mesmerized by the two cockheads bobbing up an down in front of him. He stopped playing with his tit and pussy to crawl closer on all fours, but Sarah stopped him.

"Listen, slutboy, we're gonna do this my way," she told him and grabbed his head with one hand. With the other she took her upper dick and aimed it at Adam's mouth. Her brother opened up eagerly, sticking out his tongue and moaning in anticipation. He could not wait to taste her - it had been so long! The tip was already dripping pre, and it was inching closer... and closer... He did not dare move so he didn't anger his sister, but his whole body was quivering in anticipation, his snatch twitching eagerly.

Then, the tip of Sarah's dick hit his tongue, the other gliding under his chin, smearing it with pre. The taste exploded into his being, making his whole body shudder. Sarah chuckled and slowly shoved it in further. His lips, definitely fuller than they had been in the morning, caressed her dick from all sides. Inch after inch went into his hot, waiting mouth. Adam's eyes were half-closed in bliss as the musk of Sarah's last orgasm assaulted his nose and the taste of pre filled his whole gullet. Muffled moans rose from his throat.

Sarah's second dick meanwhile was sliding along his neck, all but neglected. But Sarah had other plans.

"Alright, 'Ada', get that other cock between your tits like a proper slut," she instructed him. The words struck a cord within him. He loved how true they rang. Yes, he was a slut. His sister's slut, ready to please her anytime and always eager for her cum - and her dicks. He grabbed Sarah's second cock and angled it down between his tits that were already slick with precum and drool.

Using both hands, he caught the throbbing rod between his huge bust, pushing it up and jiggling his boobs for additional stimulation. With both cocks well-situated, Sarah grabbed Adam's head with both hands and started pumping away. His moans rose in intensity as he feverishly tried to match Sarah's pace with both his sucking and the titjob he was giving. He was not very successful with the latter - the rapid thrusts his sister rammed into his face made her second dick slide around wildly. Only due to their size did she not slide out of Adam's breasts.

Her brother was loving the face fucking she was giving him, even though he could barely breathe, gagging on Sarah's upper cock at the end of every stroke. The rough treatment made precum spurt from his sister's dicks, smearing him from the inside and the outside. The feeling was marvelous. So slick! So tasty! Their moans, his muffled, hers rising in volume and intensity, filled the whole hallway. The combined stimulation of Adam's tight mouth and the softness of his cleavage almost overloaded her senses.

She drove his face into her crotch and with one last, keening moan, she unloaded both dicks on her brother. The sticky juice coated his throat and splashed across his bosom, painting his neck white from the inside and the outside at the same time. Sarah's knees buckled and she sat on the floor, leaning against the wall. Adam followed her and eagerly kept sucking, alternating between both dicks to get every last drop. They didn't even have time to soften before Sarah's arousal filled them to burst.

As she came down from her orgasmic high, she looked down at her slutboy brother, still entranced by her twin appendages. While she liked his eagerness and initiative, he was her slut. And a slut did only as she was told.

"Naughty slutboy. Did I tell you to keep sucking? I think a bit of punishment is in order."