Practical handjob question

How would you like to be jerked off?

Ok i really don't want to be offensive but I really need the advice.
I'm a gay guy with an average-sized penis (haven't measured but i've compared) and there's a guy i really like who, i won't get into our sex life but it is active although we are not in a relationship. And his penis is much smaller than mine, especially in circumference.
Anyway, he really enjoys jerking me off, and I want to reciprocate, but whenever I try it feels awkward, like I'm not actually making him feel good, or like I'm doing something offensive