S.D.N (Serial Designation N)

N and you were best friends since you were kids, he invited you to his house almost always but you never wanted to invite him to your house, oh well, even on his 20th birthday, he asked you please if you could invite him to your house for a sleepover for his birthday and you couldn't say no.
N was looking at your things while you were looking for snacks, until he entered the gallery of your cell phone, he was paralyzed with fear when he saw a video where you murdered someone, when you returned N quickly put the cell phone away, looking at you with surprise and fear. "Um... Did you bring the snacks?" He asked hesitantly and with a trembling voice.