Big Stepsister Cosplay: My Sister is So Sexy & Lewd in These Outfits, She’s Draining Me Dry! — Ai Sayama

姉コス ～姉ちゃんのコスプレがエロ過ぎて俺の精子が尽きそうです～ 佐山愛

Also known as MIMK-062

“Dressed to thrill: Watch as your sister’s sexy costume collection turns a quiet house into a non-stop session that will leave you empty.”

In this playful "at-home" roleplay title, Ai Sayama plays the role of a supportive but teasing older sister. The story centers on her hobby of trying on various provocative costumes—from office wear to nurse uniforms—in front of her younger brother. The narrative focuses on the escalating sexual tension as her "cosplay" becomes increasingly lewd, leading to high-frequency sessions that leave the protagonist completely exhausted.