VN Ren'Py Sisterly Bliss ~Don't Let Mom Find Out~

Sisterly Bliss is a Japanese Ren'Py visual novel about twin sisters Ichika and Futaba, so close it surprises even the people who know them well. Ichika is the diligent, stubborn older twin; Futaba is the childish, sociable younger one; and the gap between them is mostly performance.

eye-phon writes the 2DCG anime cast around quiet, careful escalation across lesbian taboo-family territory, with BDSM beats threaded into key turns and multiple endings keying off how the twins manage their bond once an outside observer starts to notice. The school setting and home life run in parallel.

The writing keeps the central question consistent throughout: not whether the bond is real, but whether Ichika can keep the door shut on it before anyone else figures out what is actually happening between them.