He needs to train his bottoms how to use poppers effectively....For the top, it does not matter when they take a hit, but poppers relax the anus muscles, so the btm will most benefit if they take their 1st hit just as the head is piercing the hole.
I NEED a pup like that. I would love to smell his feet and suck his toes while he's getting fucked by dad. I'd probably cum all over the soles of his feet.