Saikin, Imouto no Yousu ga Chotto Okashiinda ga.
Mitsuki and Yuuya have just become step-siblings, and are working to adjust to their new lives as a family living within the same house. While Mitsuki is cautious of this new relationship with her ‘older brother’, her inhibitions quickly take a turn for the perverted when she’s suddenly possessed by Hiyori, a ghost girl with amnesia. As if things couldn’t get any worse, Hiyori forcibly outfits her with a chastity belt that’s so restrictive it often causes the girl to pee herself - not to mention, in order for Hiyori to finally reach heaven, Mitsuki needs to experience a certain amount of sexual pleasure and energy… with her big brother! Now, between trying to not soil herself and trying to get used to Hiyori’s hands between her loins, Mitsuki will do her best to survive her new "family" life with, or without, her virginity intact.