That chair is suspicious…! Are you really just getting a massage?Sound effect: “Whirr…”Uhh… Something feels suspicious…There are so many suspicious pieces of furniture in this cafe…What are you doing on a machine that moves so intensely?! Pervert! Sexual harassment!Sound effect: “Kung! Kung!” Suspicious Furniture MotionsS-... Stuck-in-well!?
This is some weird Korean english phonetic pun
In Korean, the phonetic of what Koharu is saying is "seuteog-in-wel". It's very close to how in english you would say "stuck in well" like being stuck in something like Koharu thinks Izuna is. NOW YOU GET THE JOKE!]