New bf wants me to preform oral on someone else…

My new boyfriend (41M) wants me (26F) to suck someone else’s dick & tell him about it in bed OR wants to watch. We are new together and he expressed his kink to me recently. I do not kink shame & I told him I’d never judge him & support him 100%. I told him I’ve never tried that but I’d be willing to try. Just have to find someone who is cool with me ONLY giving them head & leaving. Which has been hard to find- so far. He’s very ashamed of it & thinks something is wrong with him. When we are having sex, he wants me to tell him about me “being naughty” so he can stay hard.

Which- occasionally, I’ll get in my head and think.. “is just me BEING ME not good enough to stay hard?” And then I spiral, but realize that’s me being selfish..

This is new for me. I got out of a 10 year relationship recently & we were 100% monogamous, so doing this feels somewhat wrong to me. I’m not attracted to anyone else like I am to him, but I wanna be perfect for him& keep him hard & having fun. He’s into my kinks (being slapped / dominated / etc) & does them well, and I would love to reciprocate! I just do not know how to navigate. Does anyone have any advice for a beginner?