Boy caught nude

This vid has always been a mystery to me. I don't think those tighty whites belong to the boy trying them on, Then there's a naked figure that crosses the lens, could it be his fuck buddy and those briefs from that pile of clothes belong to him. Putting on a pair of briefs wouldn't normally cause someone to get a raging hardon. So he rubs them on his boner and decides to try them on, they appear to be about 2 sizes to small, as his balls hang out the sides and he feels them up. He then takes them off and tosses them back in the pile of clothes, once again he picks them back up and rubs them against his pecker again and puts them on for the last time. I know it's pretty common for gay teens to swap dirty undies after sexual encounters just so they can feel where their buddy's cock/balls and asshole came in contact with...