Yuko Onono, an extreme sistercon yoga instructor, decides to stop her beloved sister from bringing along her fiance by any means necessary when she learns about their upcoming visit. Realizing that something was off, my fiance remembers seeing Yuko using some sort of penlight-like device on her sister earlier. He then proceeds to blackmail and train Yuko into submission while trying to break off his engagement with her sister...

ヨガインフルエンサーの夕子は超がつくほどのシスコンで、愛する妹が婚約者の僕を連れてくること知り催●で阻止することを決行。異変に気づいた僕は、夕子がペンライトのようなもので彼女に妙な仕掛けをしていたことを思い出し、逆に夕子を催●にかけて復讐調教。性奴●にしながら婚約者の催●を解こうと試みるが…