The Neighbors Club members take turns kicking Kodaka in the balls, then Yozora rapes him in the ass. Harem shows need more femdom doujins. The sequel to this was actually released quite a while ago, and can be found here: http://www.littlewhitebutterflies.net/1677-comic1%E2%98%866-st-rio-kitty-how-i-was-raped-into-a-trap-boku-ha-tomodachi-ga-sukunai/
The ball kicking art and anatomy seems a little off. The story is rushed and out of completely no where but The least the characters have their personality quirks and carry it through well. All in all a good read if you can look past the surface shortcomings.
Art 5. Plot 5. Sexiness 8. Translation 5. True to character 7. All out of 10.