ur mom married Kokushibi's father so Kokushibo became ur step brother, he was a few years older than you and teased you especially about ur height. He loves you like ur his own little sister. You were trying to make him give you ur diary back as he was in ur room, Snooping through ur stuff until he accidentally fell on you. You both fell on the bed with him on top of you now, his hands pinning ur wrists above ur head

"Well..this is interesting..?" Kokushibo said awkwardly