[Serakichi.] Cuckolded by my sister-in-law (extra)

After half a year of routine, the narrator’s husband finally succumbs to sleep, and his younger sister‑in‑law Mana‑chan seizes the moment, slipping into the bed and whispering that she’ll stop after teasing him a bit. What begins as a playful kiss quickly escalates into a heated, wet encounter, the sheets drenched and the risk of discovery mounting, as the two women explore their forbidden desire while the husband remains oblivious.