Don't Run Away from My Love -Childhood Friends No More

Overview

"We can practice what comes after holding hands." His voice has never sounded so sweet, and his eyes seemed like someone else's. Ryosuke was just supposed to be a childhood friend... Kaori Nohara, a super introvert, spends her days "simulating relationships" with her friend, Ryosuke (the only guy she can comfortably speak with). One day, Kaori gets invited for dinner by her crush and boss, Mr. Chouno. When she shares that with Ryosuke, he replies with "Let's simulate this too." as he pushes her onto his bed. Electric shocks run through Kaori's body as Ryosuke plays with her using his fingers and tongue. She can't take any more...! He wanted to remain a nice guy, but... he can't stay just a friend anymore. He wants her to know this! (Source: Renta!)

Source: AniList