mio purposely kiss sakurako because shu was about to kiss her because sakurako wanted a kiss from shun and mio doesnt want that so he just went in do it so shun wont kiss her

in the sunset, after sakurako ship left, mio looked at shun and slap him, he was upset jealous why he just leaned and almost kissing her, mio hated that

"Why didn't you reject her request.."

he said this as little tear in his eyes as he clutch his hand and looked at him upset as he doesnt have mood to talk to him