Not me, but my longtime fuck buddy "Dave", the fourth of five (yes, five!) brothers often told me of their wildly unconventional upbringing.
The oldest of the five, "Adam," shared a room with Dave back in the day, and that's where it all kicked off. It began innocently enough: relatives crashed for a visit, forcing the boys to bunk together in one bed. One night, Adam's rock-hard cock started grinding against Dave's ass, through both sets of pajamas. Even after the guests cleared out, Adam couldn't resist sneaking back into Dave's bed for more of those late-night dry humps, grinding until he exploded. Things heated up from there, evolving into full-on Adam fucking Dave, night after night. To Dave's delight, Adam occasionally flipped the script, letting his brother top him... though it was rare.
Dave never crossed that line with the next brother up, "Brad." As far as he knows, Brad's as straight as they come.
Then there was the third-born, "Carl," who was closest to Dave in age and became his first real confidant. When Carl stumbled onto porn, he'd call Dave to his room to share this. It wasn't long before it turned into jerk-offs together. Finally, Dave spilled the beans about Adam's nocturnal visits. Intrigued, Carl begged to give topping a shot, and soon he was balls-deep in Dave, rutting away with abandon. Reciprocity? Not on Carl's menu—he kept things strictly one-way.
Years later, the baby of the family, "Ethan," came out to Dave as gay, too. Turns out, he'd gotten his initiation the old-fashioned way: courtesy of big bro Adam's expert touch. Dave and Ethan never hooked up directly, but they weren't above swapping conquests to spice things up. (Hell, I was one of those lucky trades.)