This brought me memories... I used to do that (orssimilar to that) in the shower, with a cousin who was 4y older than me... We started when I was 8. I didn't even know this had a name, but I just thought it was fun. We never went any further... Just this docking and some butt cheek rubbing. I knew I was a gay bottom since then...
Don't feel sorry... When a guy has a tiny dick like that, he learns he was made to be a bottom and he develops skills to achieve pleasure to himself, by giving pleasure to a top with big dick.
So fuckin' HOT!!! I would love to grab a few of my more feral roaddogs and run a train on him (only with his eager consent) and keep him "airtight" all weekend long!