Looking for a BL

I suddenly remembered this out of no where but the plot was like the uke was a bdsm trainer who would train subs to be auctioned off to doms. (as far as I can tell he spanked them) And he wanted to experience that too but felt as if he couldn’t, then the ml comes and gain interest in the mc bc of his build and they (yk) in some closet and more I can’t remember. Pls help find it ٩(๑❛ᴗ❛๑)۶