My nephew deepthroats me

Me (50m) and my nephew (25m) Have always been pretty close, im like the cool uncle. We sometimes hang out and smoke weed together. A few months ago he was over, hanging out and we were smoking, he pulled up a video of a woman deep throating a pretty huge cock, and showed it to me, he was like 'how the fuck does she do that?' I said, practice and probably throat spray. He asked what throat soray, I explained that they make a spray that numbs the throat and makes it easier to deep throat, he was fascinated and started researching. A few days later we were hanging out and he pulled out sone spray. I laughed and asked " you really bought throat numbing spray?" Wtf dude... A little later he pulled it out again and I asked why he bought it, he said he was curious if it worked, then sprayed some in his throat. I was like "dude, how are you gonna know if it works, and why did you try it?" He said we'll just incase I need to deep throat a cock. I asked if it was working and he said he could tell unless he tested it on a cock, and mine was the only one there, "whip it out for research" he got down on his knees in front of me and opened his mouth and said, "for research" So I whipped it out and he went off on it, it was definitely not his first time sucking cock, I said "you've done this before" he just looked up at me and went "uh huh" then throated my whole cock. He was amazing, he only stopped to say he's been wanting to do this for years. Now every time he comes over to smoke he sucks my dick, he's the best I've ever had.