hi anon!! honestly, i think if sukuna did, it would be inadvertent. many of my headcanons of this nature actually lean towards sukuita, im not 100% sure why, but i think it has something to do with me not being able to imagine sukuna doing anything but worshiping megumi. however! i am a sucker for toxic sukuna, so i think that he wouldn’t be obvious about it if he noticed cuts on megumi. i think he would “encourage him” in the way of being super toxic, only to swoop back in and play the role of the concerned and adoring partner when they reconcile. megumi’s white knight who finds him bleeding on the bathroom floor and coos at him, makes megumi promise to never hurt himself again, knowing that the next time he leaves megumi will be right back here, waiting for sukuna to patch him up. i hope this makes sense, honestly ive not written much dark stuff like this but it is interesting to me!! thank you for asking 🫶