First off, you are talking male2male sex here. HE could not get you off??? Why would it be his exclusive duty to get you off? Look, this is not a m2f sex, where some sort of an old 19 century 'gentlemanly code of conduct' requires that a male does everything to make sure his female partner reaches her sexual bliss. You are having sex with another dude. Sure, he should try to give you as much pleasure as he can, and you owe him the same. But neither he nor you are under any obligation whatsoever, to make sure that the other dude busts his nut. Do not buy into the hetero-logic and their mores. This is an altogether different ballgame. Do your best and leave it at that. You are obliged to be reasonably fair and honest. Other people's orgasms are your joy and intention, but by no means, your or his obligation.
Second, sex is only sex. Great as it mostly is, it still is only sex. It does not give you a college degree. It does not get you promoted (not in this case, I recon). It does not add a sixpack to your abs and inches on your biceps or chest. And it usually does not balance your checkbook either. It keeps you mentally and physically healthy & balanced & fulfilled. But, no, no matter what they say, it really does not move mountains.
Third, if you go through these boards, you will soon come to the conclusion that a very significant number of posters here completely dismiss the idea of ONS, casual sex, anonymous sex and sex for the sex's sake, if you will. Sex only makes sense according to them, in a committed and blissful LTR with the man of your dreams, usually referred to as Mr. RIGHT (as opposed to a far more popular and rather useful: Mr. RIGHT NOW).
You want to think long and think hard before you buy into an essentially heterosexual and very conservative theory. Sure, a LTR with a cool dude and loads of meaningful sex with him are a both very swell and appealing ideas. Nothing can possibly be wrong with that.
However, the fact of the matter is that unlike females, very many males do not need to create any significant emotional bonding in order to get sexual with each other and even genuinely enjoy every bit of it. You want to have some company, some fun, bust your nut and move on. You do not want to marry the the dude right away. If you stay friends and possibly buddies or even more, that's just great. If you don't... that really doesn't matter so much.
There is a substantial evidence out there that men have been hard-wired to try and spread their seed as far & wide & as often as possible. Sure, you can consciously choose to 'evolve' and espouse a heterosexual 'happy family model', if this is how you feel. After all, this is your sex, we are talking about here, rite?
Or you can look deep into your heart and possibly come up with an altogether very different truth.
Your call.
SC