... I don't get it. What did Miho figure out?

MarqFJA87 said:

... I don't get it. What did Miho figure out?

Maho figured out what Miho is doing and Miho figured out that Maho figured out what Yukari is doing...I figure?

Krugger said:

Maho figured out what Miho is doing and Miho figured out that Maho figured out what Yukari is doing...I figure?

... If that's the intention, then the artist flubbed by not showing how Maho figured it out. Not even by, say, having faint sounds leak from Miho's side for Maho to correctly deduce the nature of.

I believe the implication is that Miho figured out that her older sister is still a virgin, and Maho figured out that her little sister isn't.

Which, if you don't have any siblings, I'll tell you, it's a hell of thing to find out.