Koume is a junior-high student who initiates a sexual relationship with Isobe to strike back at an upperclassman who spurns her and couldn't care less about her supposed retaliation.
WARNING: The following list deals with subject matter not appropriate for children.
Some of the sex in Octopus Pie has been painful and uncomfortable—not that partners are outright abusive, but the characters aren't above using one another or slinking into apathy.
So, for example, Alice is much older than the other two.
For what it's worth, I've always loved this scene.
Birdland starred a married lawyer who has having affairs with two strippers, while his seemingly stuck up wife is having sex with her patients while she hypnotizes him.
After many adventures they manage to get away in an amphibious tank and reach an island inhabited by cannibals.
The book shows polyamorous, queer love as just as important and loving as monogamous, heterosexual sex, and it's beautifully refreshing to see books where people have exactly the kind of relationships and sex that they want and deserve.