Melancholy of Koorimachi Wakana

What do you call these guys? Fuckboys? Mansluts?

Also, I think Naeshiro is genuinely fond of Koorimachi, but her
interest in him is purely pragmatic.  She certainly doesn't love
him, but she wants to have some fun, so she figures she may
as well fuck around with an experienced guy who knows how
to please a woman.  In that sense, the girls are using Naeshiro
as a mere sex toy.

I don't think Koorimachi has any illusions about Naeshiro.  She knows
he's an incorrigible horndog, and she's reluctant to join his harem, but
(like the other girls) she's willing to tolerate his wayward ways, as long
as she can enjoy sex with him "on occasion."  However, she draws the
line at group sex involving the other girls (probably because she wants
to maintain at least the pretense of exclusivity).

Of course, in the wonderful world of hentai, Koorimachi could always
change her mind.  Bring on the sequel.