This was at a time when my girlfriend and I were living together, in a small house with just one bedroom.
My girlfriend's younger brother came to stay with us over the summer for about 10 weeks, sleeping on the living room couch. He was 19 at the time, and he was spending the summer with us to get an organic chemistry course required for admission to medical school out of the way at a less demanding summer school than the university where he was studying.
I'd met him on a few occasions before, and I was always struck by how closely he resembled my girlfriend--not just his blond hair and pale blue eyes, but the shape of his face, his finely turned nostrils, his refined features, his ingenuous and persistent smile--he was a boyish copy of my girlfriend.
My girlfriend had a nine to five job, but I had a very irregular work schedule that often found me at home alone with her brother during the day. Sometimes I'd engage him in talk for a while, but he would usually turn back to his books after only a few minutes of conversation. Organic chemistry isn't easy anywhere, and he was a very disciplined student.
One day I came home unexpectedly in the early afternoon. When I stepped into the living room, his lean and athletic body body lay sprawled on the couch, completely naked. His arms and legs were spread, his head was tilted back, his mouth was open and his eyes were closed. He was asleep.
My eyes were almost involuntarily drawn to his delicate cock, but what grabbed me most viscerally was the redness of his lips and his nipples set off against his pale and nearly hairless skin. This was exactly what drove me wild whenever I saw my girlfriend nude.
I stared at him for a moment and then felt ashamed. I turned my head just as he opened his eyes. He pulled on his shorts. He claimed he'd been up late the night before studying for a test he'd taken that morning, he'd fallen asleep as he was getting ready to take a shower.
But it dawned on me that he must have dozed off after jerking off. After all, especially at his age, he must have had a healthy need for sexual release, and no other outlet while he was living with us.
I began to wonder about his sexual activities and experiences. As these thoughts entered my mind, my scrotum tightened and my cock stiffened. I'd rebuffed homosexual advances once or twice, but now, to my utter surprise and confusion, the idea of what it would be like to have sex with my girlfriend's brother took hold of me.
After that, I repeatedly paraded my own naked body--I've always worked hard at keeping myself in excellent shape--through the living room on the way to the shower (when my girlfriend wasn't present, of course). I did this to encourage him to do the same, and also in the hope that maybe, just maybe, he might somehow signal that he reciprocated my bisexual attraction. Once--and I'm still embarrassed to think about this--I even masturbated noisily in the bedroom with the door slightly ajar and then walked naked through the living room with my cock still half-erect and glistening with moisture.
But these efforts were all useless. He never displayed himself to me again. He was always friendly towards me, but his eyes remained glued to his books whenever I walked past. He never gave the slightest hint that even the most innocuous of my wildly proliferating fantasies might become a reality.
Still, I had plenty of opportunity to jerk off when I was at home and my girlfriend was at work. Believe me, I put my fantasies about her brother to good use. I still do.