[Ohiya Horoyoi] Kinou Made wa Imouto no Otehon datta | Before Yesterday Clearly Still Keeps Saying How much They Admire Me [MTL]

An ever‑smiling younger sister repeatedly declares how much she admires her brother, turning his everyday presence into a teasing, intimate encounter that quickly escalates to a condom‑filled night. A sudden intrusion by another character forces the pair to confront the danger of being caught while the brother wrestles with his conflicted feelings. In the aftermath, he apologizes for failing to meet her expectations, leaving their forbidden bond charged with lingering tension.