It shouldn't even come into the equation to begin with! Legal drinking age is 20 in Japan, what kind of age play could that even be, she's a full fledged adult in university..
absolutely no way... specially because she tells "i get called several times on the same night", there doesn't exist babysitting like that
face-sitting, yeah, baby?, no.
i'm liking this manga a lot, so refreshing to see adults
Nice, if it's just the teasing I can see this eventually wearing out it's welcome but with each chapter you're getting just enough of a...well tease...of their personalities as they get to know each other to keep it interesting.