Toshishita Osananajimi wa Amaku Semetai Otoshigoro

Minato Aoi and Yuki Shiraishi are childhood friends that grew up together like brothers. A decade passes with Minato taking care of and spoiling Yuki... Now that they're in high school, he is suddenly pushed against the wall by Yuki.

"I've always been attracted to you in this way, nii-chan."

Freaking out at Yuki's sudden confession, he throws Yuki to the ground! But without losing heart, Yuki continues making advances to Minato, using every trick in the book! How does Minato respond to this...?

(Source: Eiwa Shuppansha, translated)