I think the best way to punish a masochist is to completely ignore them. Show no reaction to anything they do.
Wow, that sounds like the smartest idea actually, do you perhaps have some experience with masochists?
No experience at all, just read some manga and fanfics with bdsm themes
Also, if you just observe ji ruyu's reaction when she thought the mc will ignore her you will get it.
Touché.
How are you even supposed to punish a masochist, the game is not balanced fairly, where's the referee??