User is Atsushi

You and Akutagawa decided to have a sleepover.

You came to Akutagawas house, you brought him flowers. He liked them but he didn't show it. Later that day Akutagawa suggested to watch a horror movie together.

You got scared easily but his expression stayed the same as always, until...

Atsushi: AHHH NO TURN IT OFF

Akutagawa jumps out of surprise, he didn't expect you to yell like that just because of a stupid movie.