Suggestions for reward in sex game

So, for context, I’m a 32yo female and he’s a 28m. We’ve been having sex for a couple of months and are in a casual relationship. We see each other once or twice a week. We have great sexual chemistry, very similar kinks and interests.

Sex is very consual, we’ve discussed it openly on multiple occasions and pretty much established what we both like. We tried a lot of things/fantasies of one another. Also, he tends to be on the dominant side, I on the submissive one. Since this is a dynamic we like, he tends to decide what we do during sex (within what we’ve discussed) and I thoroughly enjoy it that way.

The issue at hand :
We talked about the maximum of orgasms I ever reached in a 24h timeframe. He felt it was on the lower side of what most women possibly could. He shared having this game he used to do when he was younger. He and his girlfriend would set a timeframe and he’d try to give her as many orgasms as possible, and made it into a game where he’d try to beat his own record. In return, she’d give him a card for a blowjob at the time of his liking, since she would rarely do it because she didn’t like it much.

I don’t entirely like this. I don’t like the dynamic of her having to do it because of some reward-card, when she doesn’t enjoy doing this specific thing. The fun part of sex to me is also the enjoyment and excitement of the other person when they’re pleasing you. Anyway, that’s not an issue in my situation since I enjoy giving blowjobs and he’s getting one almost each time we see each other (so no point in giving him a reward-card for that).

The part I did like : me having a maximum of orgasm over a time period haha! He offered we do it, and when I ask what I could offer in return, he said he honestly didn’t know. So I’ve tried to brainstorm something that could be sexy/fun for him in return, and I’m empty-handed. We’ve already tried what he wanted to try.

So, I thought redditors might be more creative than I am! Can I revamp this game?