I’ll be a great doctor with excellent bedside skills.

I’ll be perfectly happy.

But something about Natasha makes me think my life could be extraordinary.

It’s better for her to be mean and for us go on separate paths. I can think of exactly no ways that my parents (mostly my dad) would be okay with me dating a black girl.

Still, I give it one last try. “What would you do with a time machine if you had one?”

For the first time since we sat down, she doesn’t seem irritated or bored. She furrows her brow and leans forward.

“Can it travel into the past?”

“Of course. It’s a time machine,” I say.

She gives me a look that says there’s so much I don’t know. “Time travel to the past is a complicated business.”

“Say we’ve gotten past the complications. What would you do?”

She puts down her coffee, folds her arms across her chest. Her eyes are brighter.

“And we’re ignoring the grandfather paradox?” she asks.

“Completely,” I say, pretending I have a clue what she’s talking about, but she calls me out.

“You don’t know the grandfather paradox?” Her voice is incredulous, like I’ve missed some basic information about the world (like how babies are made). Is she a sci-fi nerd?

“Nope. Don’t know it,” I say.

“Okay. Let’s say you have an evil grandfather.”

“He’s dead. I only met him once in Korea. He seemed nice.”

“Are you Korean?” she asks.

“Korean American. I was born here.”

“I’m Jamaican,” she says. “I was born there.”

“But you don’t have an accent.”

“Well, I’ve been here for a while.” She tightens her hold on her cup and I can feel her mood starting to shift.

“Tell me about this paradox,” I prod, trying to distract her. It works and she brightens up again.

“Okay. Yes. Let’s say your grandfather was alive, and he was evil.”

“Alive and evil,” I say, nodding.

“He’s really evil, so you invent a time machine and go back in time to kill him. Say you kill him before he meets your grandmother. That would mean that one of your parents is never born and that you are never born, so you can’t go back in time to kill him. But! If you kill him after he meets your grandmother, then you will be born, and then you’ll invent a time machine to go back in time to kill him. This loop will go on forever.”

“Huh. Yes, we’re definitely ignoring that.”

“And the Novikov self-consistency principle too, I guess?”

I thought she was cute before, but she’s even cuter now. Her face is animated, her hair is bouncing, and her eyes are sparking. She’s gesturing with her hands, talking about researchers at MIT and probability bending to prevent paradoxes.

“So theoretically, you wouldn’t be able to kill your grandfather at all, because the gun would misfire at just the right moment, or you would have a heart attack—”

“Or a cute Jamaican girl would walk into the room and bowl me over.”

“Yes. Something strange and improbable would happen so that the impossible couldn’t.”

“Huh,” I say again.

“That’s more than a ‘huh,’ ” she says, smiling.

It is more than a huh, but I can’t think of anything clever or witty to say. I’m having trouble thinking and looking at her at the same time.

There’s a Japanese phrase that I like: koi no yokan. It doesn’t mean love at first sight. It’s closer to love at second sight. It’s the feeling when you meet someone that you’re going to fall in love with them. Maybe you don’t love them right away, but it’s inevitable that you will.

I’m pretty sure that’s what I’m experiencing right now. The only slight (possibly insurmountable) problem is that I’m pretty sure that Natasha is not.

I DON’T TELL RED TIE the complete truth about what I would do with a time machine if I had one. I would travel back in time and make it so the greatest day of my father’s life never happened at all. It is completely selfish, but it’s what I would do so my future wouldn’t have to be erased.

Instead, I explain all the science to him. By the time I’m done, he’s giving me a look like he’s in love with me. It turns out he’s never heard of the grandfather paradox or the Novikov self-consistency principle, which kind of surprises me. I guess I assumed he’d be nerdy because he’s Asian, which is crappy of me because I hate when other people assume things about me like I like rap music or I’m good at sports. For the record, only one of those things is true.

Besides the fact that I’m being deported today, I am really not a girl to fall in love with. For one thing, I don’t like temporary, nonprovable things, and romantic love is both temporary and nonprovable.

The other, secret thing that I don’t say to anyone is this: I’m not sure I’m capable of love. Even temporarily. When I was with Rob, I never felt the way the songs say you’re supposed to feel. I didn’t feel swept away or consumed. I didn’t need him like I needed air. I really liked him. I liked looking at him. I liked kissing him. But I always knew I could live without him.

“Red Tie,” I say.

“Daniel,” he insists.

“Don’t fall in love with me, Daniel.”