Handjobs??

Ok so my boyfriend and I have been together for 8 months and he fingers me pretty often. Im a sexual assault survivor and We’re really big on consent obviously. I offer every time to return the favor but he tells me not to worry about it and im just worried it’s unfair. We’ve talked about insecurities and what not but how do I make him feel more comfortable? I just hate that I can’t return the favor.