Yeah I know of grapes that have too thick or bitter skin so even when you put them in your mouth you will be left with the skin intact and either swallow it whole with some water or spit it out. So if you really like them peeling would make them more enjoyable :)
who peels grapes :I
I saw ppl peeling grapes in a different manga too.........
WHO PEELS GRAPES???(╯°Д °)╯╧╧
Or am I the weirdo here
http://www.mangago.me/read-manga/sweet_dinner/mi/58259738b18248e340f4002f60085570_chapter-1/18/