WHAT TO DO WITH BOYFRIEND GETTING HARD/?

Last night, my boyfriend and I were making out a few times. Sometimes it got kinda hot and at some point I felt he was hard and i think had an or something. I thought, uh oh...but it's perfectly natural and he can't control it.. so i acted like i didn't notice. he didn't say anything either. well, i don't know if I shouldn't have encouraged it more, cuz i went on top of him a few times and he touched /rubbed my a few times with his hands. also throughout the night he made some noises, like moans and stuff. and I mean when he touched me sometimes and we were kissing i think i moaned too. we've only been dating for a week and a half but we've known eachother since febuary. we've become really close and we, i think, are infatuated... we're only 15 (me) and 17 (him).. how should I deal with his s and stuff in the future? you can use your opinions..