Corey only had moments to feel confused. All at once his cheeks went hot; he inhaled in a deep, high gasp and felt an electric surge through the core of his being. His hands grasped numbly at his thighs. His flesh tingled out from his groin, his penis beginning to swell against the wet cotton fabric of his briefs. He jerked his hips upward as it began to spurt, his underwear becoming transparent as his mutant seed joined that of his older brother's.
Kyle felt guilt. At least he tried to feel guilt through the fog of lust he'd been fighting through since that fateful call to the cheerleader. He couldn't speak, not that Corey could have listened in his state. Kyle was working on instinct now, kicking his shoes off and peeling his jeans down his legs. He ripped his shirt off over his head and now, completely nude, reached over to help his brother do the same.
The younger brother locked eyes with the older as he was seized with pleasure so great it edged into pain; he barely knew how to relieve either. He saw Kyle remove his jeans and his stallion cock swing up, flinging thick droplets of cum and smacking against his face before it came to a quivering erect height, vibrating from his pounding heart and constant, pulsing release of the slick, sticky fluid. Corey could only admire the mess for so long before his eyes screwed shut as his own newly malformed shaft broke through the thin cotton of his underwear.
Kyle pulled the white undershirt off Corey, the boy too transfixed to resist. His eyes darted between Corey's smooth chest, his face as it twisted in ecstasy, his bare legs as they kicked and his small adolescent sac as it darkened in color against the shredded remains of the briefs. He took his own cock in both hands and pulled it away from his view, trembling from the escalating sensations this alone created and from watching what had happened to him repeat itself upon his sibling. He'd been blinded by the intense experience when it had happened to him. He'd been too frightened to watch his friends undergo it. Now he couldn't take his eyes away. He tried for guilt again, remembered that this was his own brother, that Corey had nothing to do with any of this; that it was his fault this had been inflicted on him.
He couldn't do it. Reminding himself that it was his brother only added fuel to his unnatural passions. His mouth had gone dry. His nostrils flared as he inhaled the scent of male rut. He leaned down like a cat and pushed forward, sliding the trumped-shaped head of his cursed member up the boy's flesh to get a closer look at the changing organ.