Having sex on a train track- isn't that so dangerous- I guess both boys must have been haf, the boy humping on top looked like he was stiff as a rhino's horn and the stain on his grey underwear showed how much he must have cummed in his briefs, probably shot several big spurts, I'd say he's also very young to be smoking- 13 and a couple of months- his friend looks about 14 and a half!
