Morty knows he shouldn't be screwing around with multidimensional shit. It's dangerous, it's impractical, it's blah blah blah. But it's a potential key to unlimited energy, how does nobody see that? He's built a dimensional siphon (it kind of looks like a cardboard box with a funnel and a TI-84 taped to it, but it damn well works), keyed in the dimensional coordinates to a random plane, and by God he's going to use it.
He flips the switch and waits for the energy bar to fill up.
It does! It fills up very rapidly. Then it explodes, along with the box. There's rather more smoke than there should be, and once the smoke clears someone is standing there.
"Oh my," Morty says faintly.
Mark approaches warily, sipping from his cup of cow blood. Maybe this won't be completely terrible. (Who is he kidding. It will be completely terrible.)
She sticks out a hand. "Hey! I'm Ariel, codename Stormhammer. Peter tells me you're a vampire from space. A spacepire, one might say. This intrigues me."
"Mark," says Mark. "No codename. Not from space, either. I grew up on Earth, just not this Earth." He eyes her hand nervously and doesn't touch it.
"Hang on," says Ariel. "Fubar's pinging- uh- holy shit, what?" She turns away from Mark to focus on the mental conversation.
Here we go then. Mark waits, drinking his cup of blood and otherwise not moving at all.
"Soooo, first of all, sorry about- basically everything about this. Second, holy shit. Third, d'you want an alternate-universe-girlfriend hug?"
Hug. Ariel is slightly cooler to the touch than the average human, but she is practiced at hugs.
By some miracle, he does not break down crying. He just hugs her. Non-crushingly, even, since he doesn't have clear information about her fragility relative to vampire hugs.
Oh, fuck it, there he goes with the silent tears. He puts down his empty blood cup so as to cling to her more effectively.
This is not an entirely unexpected outcome! Ariel continues hugging and makes kind sounds.
Mark is such a fucking mess. He does not understand why these people like him so much. Now there's two of them, even. And they live in different universes. Which means he is always going to be missing a minimum of one person he is atrociously in love with. No wonder he's crying all over her in the middle of the cafeteria.
Well, nobody who knows what's good for them is going to judge; Ariel is known for uncompromising destruction in defense of small emotional men. And various other persons.
After a few minutes he lets go.
"Ugh. Sorry. I told myself I wouldn't do that."
"Man, don't apologize for feeling things. You have had the shittiest day of all shitty days. 'Sides, crying on me isn't even a problem, I don't get mucky or anything. Benefits of a TK shell and superhydrophobic clothes."
Ariel looks like she's trying very hard not to ask roughly one million questions about her male self, because it appears to be a sensitive subject. (Peter, nearby, looks like he has just eaten several pounds of not-quite-raw meat while the emotions were happening, which in fact he has.)
Mark looks... well, nearly expressionless and like he has just been crying.
Peter clears his throat with a vaguely blenderlike sound. "So. After lunch, would you like to have a detailed tour or watch some good clean blood sport? Because there's a Capture the Flag match going at Arena 99 in half an hour or so, if you enjoy superteens beating the hell out of each other. Which, I mean, who doesn't, right?"
"You don't technically need to attend every match Vera's involved in," Peter notes.
"But then who would yell that her mother is an incontinent ferret?"
"That element would be missing, yes."
Ariel shakes her head piously. "I couldn't do that to her. She'd be crushed."