Little sister came to Tokyo for work with colleague boyfriend. Due to inbound demand effect couldn't book city center hotel so stay in my room... Little sister who was supposed to sleep next to me moves to living room where boyfriend is sleeping. Eh?! Doing SEX in my room!? Pretending to sleep but so~ long!! Eh?! Until when does it continue?! Next day strict warning to little sister! Asking little sister boyfriend is ''insatiable