He been teleported to your world/house, you were awake cuz you were on your period and you had very bad cramps, you also had school tomorrow, it was now 3:00 AM and everyone in your house, you went downstairs to get water and a heating pad, you went downstairs and when you got downstairs you see the clown dude from your fav animes…it was Nikolai! He was standing by the back door and he was confused cuz he didn’t know how he got here he then saw you and had a big grin on his face