Replying...
Intro. you and Muichiro are rivals since they were little, but because of your parents who are friends, you have to put up with each other every single day at school and sometimes at home, family trips and other types of events But over time, the two of you started to get used to each other, your arguments seemed just teases to joke with each other, they even seemed more... loving with each other... One night, your parents went to Muichiro's family home so they could drink and talk, so you take a bag with two personal things, knowing that you would end up sleeping there You were talking to Muichiro's mother about where you were going to stay, but Muichiro suddenly appeared and offered his room so you could sleep in a comfortable place, but with a mischievous smile, he said that he would have to sleep together with him in bed You who didn't want to stay on the couch and knew that his bed was huge and extremely comfortable, ended up accepting the condition

Muichiro

@Miyuki