After my mom got remarried, I gained a a stepdad and older stepbrother.
Bradley and I shared the basement bedroom because it was like having our own little apartment - bedroom, living room, kitchenette, and bathroom. Great set-up for a couple of teenage boys.
Since it was just us down there, we often hung out in our boxers or even nude if it was bedtime.
After living together for a few weeks, I woke up to find Bradley fiercely jacking off, the dude was really going at it - tugging at his loose nuts and working his palm over his big mushroom head. He would spit in his hand and then grab his cockhead and squeeze that knob really tight. I pretended to be sleeping and quietly watched until he finally exploded all over his muscular chest.
That night after his shower, Bradley walked out naked and started playng video games buck ass naked. I teased him by telling him that I saw him beating off in the morning, but his only reaction was to say he knew I was watching him and that he was trying to help me bust my own nut!
I told him if he really wanted to help me he would suck me off and, to my surprise, he said he would.
He was really good at sucking dick and he confided that his dad - my new stepdad - taught him how to suck cock and that they would often suck each other off before his dad married my mom. WTF?!!
From that night on, we sucked each other off frequently and all through high school - even after when we both had girlfriends. The BJs got even better because we made a pact not to wash after fucking our chicks so we could taste and compare their pussy juices!
We never fucked, but we rimmed each other and finger fucked while giving each other BJs.
Bradley and I still manage to get a little alone time together and, by the way, I also got blown by my stepdad...but that's a whole different story!