Y/U/N is your username.

The next day you find Mark at the supermarket.

"H-hey Mark" you say quietly. "Oh hey Y/N, what's up" he says smiling. Fan-girling on the inside "um my friend doesn't think we're actually neighbors could I um get a photo" your basically shaking hoping he doesn't think your crazy or something. "Yea sure" he said walking up to you and smiling for the photo. "T-thanks" you said stuttering. He waved goodbye and went about his day. You grabbed ice cream, waffles, chips, salad, and other foods.
When you got home you could hear Mark screaming at a video game. You chuckle as you put the groceries away.

The next day you decide your YouTube vacation is over and record an apartment tour. "And over here is where I eat food mostly ice cream" you say pointing to the kitchen panning the room. "And finally this is the recording area where I record games and stuff" you walk over to your big desk that has a desktop, a bunch of lose wires and boxes of other equipment. "As you can see it's still a mess and I'm procrastinating setting it all up". You end the video pleased with the amount of footage u got. You edit and upload on your laptop since the desktop isn't set up...yet.
Y/U/N is starting to get more popular so now videos at least once a week was necessary.
You're about to go out to eat dinner when you hear something crash and the them a loud thud with some curses. You go knock on Mark's door. "Mark...it's me, Y/N, are you okay?!" you ask a bit worried, okay more than a bit. No one answers so you turn the knob to find its open, nice job Mark make it easy for people to break in. You walk around the corner to find Mark on the couch holding his shin. There's broken lamp and glass everywhere. "Y-you okay there?" you ask as he jumps. "Oh Y/N I didn't hear you come in, how did you get in" you point to the door and he curses quietly to himself. "Well you're probably wondering what happen" he asks and you nod staring at the mess. "I hit my shin on the coffee table and a glass that I put there fell, then I hit this lamp and well you can see"
You nod and chuckle as you shake your head. "You really are clumsy"
You decide to be a nice person to poor Markimoo and help clean up. "You didn't have to do this Y/N" he says sweeping the floor. "It's the least I could do for one of my favorite youtubers" you say as you pick up the shards of broken lamp and glass. With no god dang gloves I might add. You yelp in pain as you smartly cut your hand on the glass. "Oh shit that stings" you hold your hand to your chest getting some blood on your shirt, now you look like murdered someone. "You okay Y/N" he takes your hand "oh fuck come over here I'll get bandages" Mark puts your bleeding hand under the sink and then adds disinfectant. "OW MARK" you wince as it stings. "Calm down calm down" he says wrapping your hand in a bandage.
After that catastrophe was over and everything was cleaned up you started talking about YouTube. "So I heard so have a channel" Mark states while getting his tv remote. "Oh um yea it's Y/U/N it's not that popular but it's a nice little community"
"Maybe we could do a collab one day" he says like its no big deal. "Wait really I would LOVE that" you almost scream, almost. He chuckles and turns the tv on. "So how's it going with you and Jack" you say quietly. Mark blushes and turns to you. "You ship us too, I swear everyone ships us"
"Well you guys do fuel the ship AND would make an adorable couple" you nudge him kinda awkwardly.
He rolls his eyes "do you wanna get some pizza or something I'm starving" then you realize the time, you never went to dinner and now it's already 7. "Sure why not" less social activity for you.