How and where do i touch him to make him feel good (not necessarily sexually)?

He definitely could've gotten hard, for some guys even just hugging or tickling them sets them off! I would say to really focus on his neck, collarbone, shoulders..run over them lightly with your fingertips, it'll give him goosebumps. Also if you're feeling super-adventurous, have you tried his nipples yet? Some guys REALLY like when girls go in circles over them with fingers or tongues, and even very gently pinching or biting them, oppositely some guys hate this. Just ask him, or find out what he likes from his reaction, you guys should be comfortable enough to explore each other. If he DOES like his nipples being played with though, be forewarned, lots of nerve endings there and the stimulation will most likely get him hard. Your call if you're ready to deal with that, good luck!