The story starts with Hiroto the youngest brother. A handsome college student who likes hot guys and seeks them in the gym after college. Later on in his house we discover the a secret and kinky affair between Masahiro ( The eldest brother) and their foster father Shousuke. A mysterious force lingering around Hiroto. What does it want from him?! And what is it exactly?

Glad you wrote the story because oh my, it's really confusing. Thank you so much

Base +6, sngsh +6