[ClockLord (Suzushiro Nerita)] This Guy is NOT my Boyfriend!! ~The situation of the Shinomura siblings~ [Rupee]

A flustered sister insists her brother Fuyu-kun is absolutely 'NOT my boyfriend!!' even as he teases her mid-phone-call and then pins her down, coaxing her past her embarrassment with kisses and low compliments until her protests dissolve into breathless cries of 'Onii-chan' as he pushes her over the edge. Between his smug grin and her doki-doki denial, the Shinomura siblings' secret situation burns hotter with every encounter, her weak excuses crumbling the moment he touches her. A closing glimpse of a wedding dress hints their forbidden arrangement is heading somewhere far more permanent than either will admit aloud.