Kodaka is groping Sena’s boobs in the club room and they proceed to have sex. Super duper über clever plot twist at the end.
#780: (C81) [Asaiumi (Asami Asami)] Boku wa Sena no Oppai Niku wo Momitai (Boku wa Tomodachi ga Sukunai)
#739: (COMIC1☆7) [komorikiri. (Urin)] Chijou no Hoshi ~Toramaru Shou no Anal wo Zupozupo Suru Hon~ (Touhou Project)
Some kind of weird Fate/Apocrypha and Fate/Zero thing, where Ruler confesses her sluttiness and fucks a clergyman (Kotomine), and Bluebeard decides to dick Saber to teach her a lesson or something.
This is a sequel to another doujin where Ryuunosuke kinda/sorta tricked Ruler and banged her real good, thus her sluttiness. Sadly has not been scanned, and likely won’t be due to its rarity.
also this is utterly random and unrelated but happy guy fawkes day.