It seems decchi means a delivery boy who is sometimes molested by clients as a tradition, so ro thinks dechi is a boy and is worried about dechi's asshole.
It is a boy who is an apprentice for a store and does chores and runs errands.That never happened dechi...!?This is decchi.That's what decchi means, so I'd like you to stop calling me decchi dechi.What's the matter dechi?I've heard that sometimes decchis were the target of male lust, and the head clerk or customers would go after his ass.Decchi, that means you're a otoko no ko ship girl!?Whaaa!? How did you come to that conclusions dechi!?Now that I think about it, sometimes there'd be something bulging out...Decchi...!? Is your ass okay...!?Don't go saying things that will just make it worse dechi!!