[Makin] Senpai's Secret

A nervous senpai meets his sister's affectionate younger sister, Chiaki, who clings to him and hints at a forbidden encounter. When the older sister, a stocking‑clad futanari, discovers the truth, she forces a passionate kiss that reveals a hidden 'big brother' liaison and a promise of a severe lesson. The tension escalates as the younger girl, a sole dickgirl, is teased and pleasured, leaving the senpai caught between desire and the threat of never cheating again.