For teasing you can slowly move your hand down there over his stomach & then lightly stroke/massage it over his underwear along it & the tip. To get him off, hold it & move your hand up and down and you can also add in twisting motions while doing that. Make sure it’s wet either with spit, lube or oil so it’s much easier. Typically guys get close when you speed it up a little, but everyone’s different. It’s also fine to ask him how he likes it or to guide you.
Also make sure he’s putting effort into pleasing you too if you’re gonna do so for him.
