This all happened at my friends birthday party, he invited about six of us over and when it was time to go to bed his parents said they would be next door (his yard linked to his neighbors yard and they were close friends, the neighbor kid was at the sleep over)
We all got ready for bed changing in his bathroom one by one, then we all got in to bed. It was silent for 10 minutes then one of the boys who was older asked if any of us masturbated. We all said yes being horny 13 year old's he then asked us if we had ever watched porn when we jacked off. One said yes, shyly the rest of us shook our heads nervously.
The older boy then asked if we wanted to watch some, we all said yes eagerly. So he went out of the room and got my friends laptop, he went to a site and showed us his favorite movie. He started to jack his four inch dick and asked why the rest of us weren't. We all looked round nervously then slowly pulled our boxers down and started wanking.
Then about three minutes in, the older boy asked if he could jerk any of us off. My friend said sure why not. A few of us then asked if we could jack each other off, we all said yes and started jerking each other sitting in a circle.
This was very exciting to me since I had never seen another boys dick before. Eight minutes later I could hear moans coming from all the other boys and then as the boy next to me was stroking me faster and faster I started to have the most intense feeling coming from my rock hard five inch cock and then boom, I shot 3 or 4 ropes of cum all over him then he came all over himself, it was great.
Then we all cleaned up and went to sleep and stayed another night and repeated the experience. My first mutual masturbation session was great because we were all straight and could just enjoy having some fun.