Dick to dick is a great way to get acquainted or as foreplay. First a little sword plan, then a little jerking and exploring of the other guy until the pre-c starts to flow. Then a session of what my bud and I used to call “humping”(missionary grinding)
It usually didn’t take me long to cover the other guy with a coating of pre-c. If he produced pre like me, we would have our torsos wet from tits to balls in no time.
Depending on the circumstance, this was often a good time to give each other a tongue bath with frequent trips back to nurse out any new fluid filling the pipe.
Generally we did this as foreplay to get warmed up, and then we went on to some form of oral action. A good session of humping seemed to increase our loads however they were delivered.
If you were just interested in introducing the other guy to a bit of bonding, a sleeve might be just the thing.