In my last my half brother entered the father/son masturbation circle and between the brothers sex intensified.
My father had to leave for three weeks that July leaving my half bro Dan and I to carry on and we mostly abandoned the boat and just hung out together on weekends. I got permission to leave the base overnight weekdays too. It was hot and we hung out in the house naked and really became close. We jerked off more and more mutually, doing each other and exchanging sperm. Nothing bonds two men like eating sperm does-other than my own I never had before.
We began sleeping together, jerking off getting into bed, sometimes again in the middle of the night and always before getting up. Dan was more passive than me and I devised a new technique. He'd just lie there on his back hands behind his head exposing dense pits and facing him on my knees I'd straddle his thighs and gently sit on his thighs hunched up so our scrotums pushed together. I'd grasp our cocks together in my right hand dorsal sides together foreskin to foreskin moving up and down. A standard one hand grip but with two cocks. I even then was a practiced edger and could control my ejaculation up to a point precisely. Dan is a slow cummer-takes real time for plenty of my edging half orgasms, and then finally on his signal I could time a joint ejaculation shot for shot together. I could also guide the direction which was important because the dual volume of semen bordered on the outragious.
With my desire at that stage close to crazed I devised a method for controlling the combined mess. I aimed it my way (without going into further detail). That three weeks with Danny was a watershed sort of thing for me. I went further MM with him than ever before but still it didn't exceed masturbation even though maybe an extreme form of it. The result was an intense brother-bonding even greater than the crush I got on my sister masturbating with her way back in puberty. The old man got back and weekends were back on the boat Dan returned to school in California and I got tranferred to Norfolk and then discharged from active duty.