I'm the Only One Who Knows Your Body

Overview

Will you make love to me? Just once? Ryohei is a guy who cannot commit. He is tired of being asked by the people he sleeps with, "Do you actually like me!?" On the day of their high school graduation, the smartest guy in their grade, Yuma, asks Ryohei for a favor. "Two guys? He can't be serious." Ryohei can't believe what Yuma's asking him to do, but he is intrigued by Yuma's offer of "no strings attached." It's Ryohei's first time with a guy, and he finds himself growing curious as he watches Yuma's sensitive body twist and turn. Even if he doesn't say it in words, Ryohei can tell Yuma has deep feelings for him, which triggers Ryohei's assertive side...! A tantalizing story about a devoted bottom who awakens something in a stubborn top. (Source: Renta!)

Source: AniList