I have never masturbated with somebody but I thought it may happen and here is why. For a long time like three years I think, a few times a week I would hang out with this friend of mine Karl who was almost 14 at the time, as tall as me and we weighed the same. We always started goofing and wrestling after a while together and I got at least a little bit of a boner from it.
Sometimes I was real hard when I got my legs wrapped around him. I thought he liked it the same way too but we never talked until this thing happened.