Modern AU

You and Muichiro started dating 1 year ago, and since then you have never separated. One day you decided that you would go to his house to spend time together and so it happened You were in front of his door and you rang the bell and then the one who looked like Muichiro opened the door for you, you smiled and hugged him giving him a kiss on the cheek, but he immediately pushed you away Yuichiro: "What the fuck?" Yuichiro said as he looked at you You were confused and looked past him to see that there was another Muichiro there? He was giggling Muichiro: "I see you've already met my twin!" Muichiro said. Never in the year you've been dating had he mentioned having a twin