It did not take much, just the touch of flesh on flesh.  My arm on his shoulder and he would bone up, his meaty cock stretching out the nylon shorts he was wearing.  Like a Pavlovian reflex action.

It’s why I always made him go commando. His bulge would quickly attract an eager, horny fag that we can double team. His thick cock opening up the fag’s cunt, causing a scream that would allow my cock to slip easily down the fag’s throat.