I am a early middle aged family guy committed to masturbation and have performed it with lots of boys as a teen and occasional men as an adult. Also with my sister as a boy and several female adults in addition to my wife. The point is I've fought/enjoyed the idea of bisexuality since puberty and more the enjoy side of that equation. Therein lies my story about Josh.
Josh is the son of my wife's sister(a single parent) and I've kept my eye on the kid since he began sprouting hair on his legs at around 13. By 16 he had grown a lean muscular 6' athletic body but seemed more interested in sports in the locker room than on the field. Now at 22 he has a girl but truth is he still has those urges I no longer much wrestle with, and probably even beyond my joy of just jerking off another cock. For the time being Josh works in a upmarket department store in the community where we all live. By chance I discovered that the mens room in the lower level of the store surprisingly has a neatly fashioned glory hole between the end two stalls. On occasion I've masturbated in one of them for added thrill.
Well early one Saturday morning last month soon after the store opened I headed to that mens room and as I approached it saw Josh go in ahead of me. I paused a minute or two then entered myself. The place was empty except one of the last two stalls was occupied. Both my heart and my cock jumped. Quickly I entered the next to last stall. The hole was about the size of a large orange and stratigically placed at a level revealing the seats of the adjoining toilets. I pulled down my shorts and sat down. A glance showed stroking motions on the other side. I began the same getting immediately rock hard.
Suddenly there was great motion next door and there on the floor under the partition appeared two hairy thighs and knees. And then a beautiful penis projected into my space, long and thick with a turtle like glans half out of a paper thin foreskin. I leaned down into it and grasped the slightly curved upward shaft. Being uncut myself I knew exactly how to please this cock-and set to doing it with one hand and my own in the other. I lined my cock up a moment with his to get an approximation of his size which was beyond my wildest fantasies about this kid. I am about 7 3/4x5. Josh was at least 9+x6 with balls to match and thick pubes. On the floor in a public mens room doesn't allow much time for pleasure and obviously he didn't need any. I pulled his hood full back and the glans bulged and heavy squirts burst from its gaping slit. I aimed most of the sperm on my bare thighs-at least five ropes of it. A sudden flurry of activity on the other side, the stall door flew open and Josh was out of there. I settled down to a huge masturbation fuelled by my nephew's still warm sperm. The aftermath of that event will probably be another story.