I think it would have been better if Ayumi and Koshiro ended up together. Like, in the pursuit of lust towards Takashi, both Ayumi and Koshiro find love with each other. Seeing Ayumi and Takashi together infuriated me and if I saw Koshiro together Takashi that would still infuriate me! As others have stated I think Koshiro was the most mature out of all of them. I think this should have had a follow up story where Koshiro find love. （￣へ￣）
"my savage butt"
I have one...