Ty decided to keep this ethical, and wished Eli would know he and Ty weren't siblings. Hardly noticing the change, Eli was more focused on Ty's shy, hesitant reaction. "Ty, are you OK?" he asked.
"Yeah, it's just that, umm..." Ty felt like he might get cold feet now, but figured he'd better not. "Well, uh... seeing you as a guy has made me realize, I like guys." He stopped covering the bulge in his crotch, and Eli blushed a little himself as he realized Ty was telling the truth.
Eli came up to Ty hesitantly, softly put his dark hands on Ty's pale cheeks, which quickly flushed under his touch, and leaned in to kiss him. Their kiss quickly deepened, and when Eli's tongue tried to enter Ty's mouth, he responded by eagerly opening it. Ty reached to Eli's crotch and rubbed his quickly growing bulge.
Once their kiss broke, the two quickly started to undress. Eli pulled off his T-shirt so Ty could admire his toned, muscular chest, and reached to yank off Ty's, which he responded by allowing in a surprised daze. Eli's hands went to his hips and he pulled off his shorts and boxers, his seven-inch shaft emerging. Ty moved to pull off his own, but felt the older boy do it for him, and a moment later his hardness touched Eli's.
Ty lay back on the bed, as the two of them felt an almost unspoken shift in their dominance come to be conscious. Eli was enjoying a newfound sense of dominance from having a cock and a more muscular body, while Ty felt a odd comfort with the prospect of submission now he'd made Eileen physically stronger and more masculine than him. There was no question how they'd fuck, at least the first time: Ty wished his ass would comfortably take Eli's dick, and Eli would know and wouldn't hold back.
With that, Eli started to fuck Ty's ass eagerly. The smaller boy moaned and clung to the bedsheets as he was railed, while Eli held his body tightly in his firm hands and thrusted steadily faster and faster, hitting Ty's prostate as he pounded him. After a while, Ty came hard, his cum squirting messily onto the bedsheets, and Eli hit his peak as Ty clenched around him, groaning and resting atop him.
In the afterglow, Ty wondered what to do next, and whether he wanted to use his wishing powers again now...