[Terasu MC] On the Laptop My Beloved Big Sister Lent Me… [Tekkamaki] [Decensored]

An eager younger brother borrows his big sister’s laptop, discovering she’s secretly having hardcore sex with a much older man, igniting his forbidden fascination. He becomes addicted to the recordings, torn between guilt and the thrill of watching her risk everything, while she urges him to keep filming and indulge in endless fapping. The story builds tension as his desire clashes with his morals, leading to a risky, shameful climax.