the boy has some pretty intense orgasms from mixing edging with triggered PC spams.
he's got this spot, just to either side of his frenulum. if i/he pinches/squeezes this miraculous area of penis real estate he gets a serious of peen spasms. pretty close to the same throb/wave/pulse thingie he gets with orgasm.
with enough edging, a few faux-gasms, when he finally cums is a roaring, back arching, speaking in tongues affair. keep a grip the base, with a slow kinda wringing/tuggy motion will keep him hard. his next orgasm will be a couple mins later.
the only downside, after about three is more post orgasmic shudder. not as intense.. like orgasm pop rocks.
i guess is something you can explore on ya on, or with a partner. i am thinking the added arousal level of sex vs. solo might be needed to get the full results.