Sexual Tuning: Getting My Sister’s Best Friend Ready to Go

“No matter how much I sex her up, she’ll never become my girlfriend!” 

Yukino Hanaoka was the hottest girl in high school and Kotaro’s childhood friend. One day, she suddenly comes out and says something that blows his mind, “I want you to loosen me up for my future boyfriend.” 

Kotaro is shocked when he hears this, but completely loses all inhibitions when she presses her naked body against him. He gives in and runs his tongue along every curve of her body, making her writhe with ecstasy. Then and there, he decides to make her come before her boyfriend-to-be ever gets his hands on her. Unable to stop himself, he takes off her soaked panties…

Sexual Tuning: Getting My Sister’s Best Friend Ready to Go Manga also known as Kaikan Chiyuningu ~Ore wa Senpai no Sex Renshuudai ni Natta~ / 快感ちゅーにんぐ～俺は先輩のセックス練習台になった～ / Kaikan Chuuningu: Ore wa Senpai no Sex Renshuudai ni Natta. This Ongoing manga was released in 2025. This series was written and illustrated by Uki. Sexual Tuning: Getting My Sister’s Best Friend Ready to Go is about Drama, School Life story.

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