Let Tommy fuck him.

They adjust positions so that Tommy lays on Billy, suckling his nipples and pushing his cock into the tight muscle of Billy's asshole. The pressure spreads Billy from the inside out, and Tommy's impressive length strikes Billy's prostate almost immediately. Between moans, Billy sighs, "Good boy."

At this point, Billy's chest has been sucked dry, so Tommy looks up at Billy, resting his chin on Billy's chest while continuing to thrust himself into Billy's tight tunnel. Billy's never seen Tommy in such a state before. His eyes are wide with innocent abandon as he pounds himself into Billy as much as he can, and the blue phallus continues to pound Tommy too into a state of further obedience.

"Mommy," Tommy moans. It's something Tommy would say jokingly, but there's no irony in his earnest moan. "Mommy." Pounding his soul into his brother, Tommy picks up speed so that his entire body is a blur of concussive motion. Billy's body is overpowered by the pleasure as his prostate is assaulted by the speedster's crescendo. Billy cums wildly. Once Billy's orgasm has passed, Tommy pulls out of his hole and shoves himself into Billy's mouth without warning. Billy gives a muffled cry of surprise, gagging gently as Tommy's large cock pushes into his throat and erupting floods of cum down Billy's throat, activating automatic gulps with every spurt.