Marcus's apartment smells like him before I even step inside.

Cedarwood and smoke, that intoxicating blend that's become my personal drug of choice, mixed with something else—something like old paper and coffee. I stand in the doorway of his place in the converted warehouse district, trying to convince my nervous system that this is just reconnaissance. Data gathering. Behavioral observation in the subject's natural habitat.

My nervous system is, predictably, a liar.

"You coming in or are you going to stand there looking like you're about to defuse a bomb?" Marcus leans against the doorframe, amusement dancing in those gray-green eyes. He's in jeans and a black henley that clings to his chest in a way that should be illegal. His hair is still damp from a shower. I can tell because I'm apparently a creep who catalogs these details now.

"Just assessing the space," I say, pushing past him with more confidence than I feel. "Environmental factors affect behavioral responses."

"Of course they do." He closes the door behind me, and the sound of it—solid, final—makes my pulse quicken. "That's definitely why you're here. Not because I asked you to come over so we could, you know, actually get to know each other."

I turn to face him, arching an eyebrow. "You realize that sounds like a euphemism, right?"

"It's only a euphemism if you want it to be." He's smiling, but there's something different about it. Less performative. More real. "Come on. I want to show you something."

The apartment is smaller than I expected—open concept, exposed brick, floor-to-ceiling windows that overlook the city lights beginning to twinkle as dusk settles in. But it's not the space itself that catches me off guard. It's what's in it.

Books everywhere.

Not the decorative kind that people buy by the foot to look intelligent. Actual books, worn and dog-eared, stacked on shelves and piled on the coffee table and scattered across the floor. I spot Camus next to what looks like a heavily annotated copy of Gravity's Rainbow. Kierkegaard sits beside a graphic novel. There's philosophy, fiction, psychology, even a few books on neuroscience that I recognize from my own research.

"You read," I say, because apparently I've lost the ability to form complex sentences.

"Shocking, I know. I'm not just a pretty face." He's watching me carefully as I move through the space, taking it in. "Most people assume I'm dumb. It's actually useful."

I turn to look at him, and something in my chest does an uncomfortable flip. "I don't assume you're dumb."

"No." He steps closer, his voice quieter now. "You assume I'm shallow. Which might be worse."

There's a photograph on the shelf—Marcus, maybe eight or nine years old, standing next to a man who has the same jawline, the same hair color. But the man's expression is cold. Distant. The kind of distance that echoes through decades.

I pick it up without asking. "Your father?"

Marcus nods, moving to the kitchen. "Want something to drink? I have wine. Beer. Coffee, if you want to be boring about it."

"Wine," I say, still studying the photograph. Young Marcus is smiling, but it's the smile of a child trying too hard. Performing for approval that clearly wasn't coming. I know that smile. I wore it for years.

He hands me a glass of red wine—something expensive, probably, though I wouldn't know. I'm a beer-and-cheap-vodka kind of girl. The wine is smooth though, velvety. It tastes like money.

"He's a lawyer," Marcus says, settling onto the couch. He pats the space next to him, and I sit, maintaining what I calculate to be a socially acceptable distance. Eighteen inches. Definitely not intimate. Definitely not close enough to feel his body heat. "Senior partner at his firm. Very successful. Very absent."

"Classic," I say, taking another sip of wine. "Emotional neglect masquerading as financial provision."

"Exactly." He turns to face me, and his expression is serious in a way I haven't seen before. "He showed love the way some people show up to work. Obligation. Duty. Never quite present, never quite satisfied. I learned early that connection was transactional. You give a little, you get a little back. You don't ask for too much because people will leave."

The words hang between us, heavy with implication.

I should leave. I should stand up right now and walk out because this is exactly what I was afraid of. This is how the experiment fails—when one of the variables starts being honest, when the performance becomes too close to reality, when the walls start crumbling and you realize you're not actually safe anymore.

Instead, I take another sip of wine.

"My mother fell apart after the divorce," I hear myself say. The words feel foreign in my mouth, like I'm speaking someone else's truth. "My father was emotionally unavailable, and my mother... she needed him to be everything. When he left, she just... dissolved. Started drinking, couldn't get out of bed, called me constantly asking if I thought he'd come back. I was eleven."

Marcus doesn't say anything. He just watches me with those unsettling gray-green eyes, and I realize he's doing the same thing I'm doing—letting someone see him. Actually see him.

"I promised myself I'd never be like that," I continue, the wine loosening something in my chest that I've kept carefully sealed. "Never dependent on someone else for my sense of self. Never so broken by their absence that I can't function. Love is just chemistry anyway. Dopamine and oxytocin and a bunch of neurological patterns that feel profound but are really just... biological programming."

"But you don't actually believe that," Marcus says quietly.

"I do." The lie tastes like the expensive wine—smooth, easy to swallow, but ultimately hollow. "I have to."

He leans forward, and suddenly the eighteen inches between us feels like nothing. I can smell him more intensely now—cedarwood and smoke and something underneath that's just him, something I'm starting to crave like a drug. His eyes search mine, looking for something. Proof that I'm lying? Permission to believe differently?

"What if you're wrong?" he asks.

My heart is racing. I can feel it in my throat, my wrists, the base of my skull. "Then I'm fucked."

"Maybe," he says, and reaches out to tuck a strand of hair behind my ear. His fingers linger against my cheek, and my breath catches. This is it. This is the moment where the experiment collapses entirely. Where I stop being the observer and become the observed. Where I stop controlling the variables and let myself be controlled by something I can't quantify.

I should pull away.

I should stand up and leave and text Sophie that the situation has become compromised and I need to abort the project immediately.

Instead, I lean into him.

His hand moves to cup my face, and he's close enough now that I can see the individual threads of color in his eyes—gray and green and something that might be gold. His other hand finds my waist, fingers splaying across the fabric of my oversized sweater. I can feel every point of contact like it's burning through me.

"Tell me to stop," he whispers.

I don't.

His lips are almost touching mine now, close enough that I can feel the warmth of his breath. Close enough that I could close the distance in a fraction of a second. Close enough that I'm trembling with the effort of not closing it.

This is what fear tastes like. Not the acute fear of immediate danger, but the slow, creeping terror of realizing you're about to lose control of something you've spent your entire life keeping locked down. That you're about to let someone matter. That you're about to become vulnerable in the way your mother was vulnerable, and that vulnerability might destroy you.

"Iris," he breathes, and my name in his mouth sounds like a question. Like a plea.

I stand up so fast the wine glass nearly slips from my hand. I catch it, barely, and step back, putting the coffee table between us like it's some kind of barrier against the inevitable.

"I can't," I say.

"You can." He's still on the couch, and the fact that he's not chasing me somehow makes it worse. "You're scared, but you can."

"No." I'm shaking now, and I hate it. I hate that my body is betraying the logic of my mind, that my hands are trembling, that my carefully constructed arguments feel like they're crumbling. "You don't understand. This isn't real. This is the experiment, and I'm losing objectivity, and if I—if we—then I can't finish the thesis, and I can't prove what I set out to prove, and I can't be the person I promised myself I'd be."

"The person you promised yourself you'd be?" He stands up slowly, deliberately not approaching me. "Who's that, exactly? Someone who's afraid of feeling anything? Someone who hides behind data and sarcasm so she doesn't have to admit that she wants this as much as I do?"

"I don't want this," I say, and it's the most transparent lie I've ever told.

"Liar." He says it without malice, almost gently. "Your pupils are dilated. Your pulse is elevated. You're breathing faster. Your body chemistry is screaming what your mouth won't admit."

"Don't," I snap, pointing a finger at him. "Don't use my own research against me."

"I'm not using it against you. I'm using it to show you that you're human. That all that stuff you talk about—the dopamine and oxytocin—it's real, and it matters, and it doesn't make you weak. It makes you alive."

I can't look at him. If I look at him, I'll crumble. If I crumble, I'll fall, and I'm not sure anyone will catch me.

"I should go," I say, setting the wine glass on the nearest surface and moving toward the door.

"Iris—"

"I need to think. I need space. I need..." I need to rebuild the walls before they collapse entirely. I need to remember why I started this experiment in the first place. I need to not feel like this—like I'm standing on the edge of a cliff and the only thing keeping me from falling is the belief that the ground beneath me is solid.

But the ground is crumbling.

"I'll text you," I say, and it's the most cowardly thing I've ever done, but I do it anyway. I open the door and step into the hallway, and the smell of cedarwood and smoke follows me like a ghost.

I don't look back.

I make it to the elevator and punch the button for the ground floor, and only when the doors are closing do I let myself breathe. My hands are shaking so badly I can barely hold my phone. I pull up Sophie's contact and type: Coming home. We need to talk.

The drive back to our apartment passes in a blur of traffic lights and my own spiraling thoughts. By the time I unlock our front door, I'm wound so tight I feel like I'm vibrating at a frequency only dogs can hear.

Sophie is on the couch in her usual uniform of vintage slip dress and cardigan, surrounded by textbooks and color-coded notes. She takes one look at me and sets everything aside.

"Oh no," she says. "What happened?"

I collapse onto the couch next to her, and the dam breaks.

Everything spills out—the experiment, the data collection, the way Marcus looks at me like I'm something worth knowing. The books in his apartment. The photograph of his father. The moment on the couch when I realized that the line between performance and reality has become so blurred I can't see it anymore.

Sophie listens without interrupting, which is either a sign of how serious this is or how much she already suspected. Probably both.

"So let me get this straight," she says when I finally run out of words. "You're conducting an experiment on fake dating, you've developed actual feelings, and instead of talking about it like a normal person, you ran away?"

"I panicked," I admit.

"Yeah, no shit." She stands up and disappears into the kitchen, returning with a bottle of cheap vodka and two shot glasses. "Here's what's going to happen. You're going to drink this, and you're going to tell me what you're actually afraid of."

I take the shot. It burns all the way down, and I welcome the pain because it's something I can quantify. Something that makes sense.

"I'm afraid," I say slowly, "that if I let myself feel this, if I admit that what's happening with Marcus is real, then I'm one step closer to becoming my mother. Needy. Dependent. Destroyed."

"You're not your mother," Sophie says firmly.

"You don't know that."

"I do, actually. Your mother lost herself in someone else. But you..." She points at me with the shot glass. "You've never lost yourself in your entire life. You're incapable of it. You're too stubborn. Too logical. Too determined to prove that you don't need anyone."

"Maybe that's the problem," I say quietly.

Sophie refills both glasses and raises hers. "To the possibility that you're wrong about love."

I clink my glass against hers. "I'm not wrong."

"We'll see," she says, and smiles like she knows something I don't.

My phone buzzes on the coffee table. A text from Marcus: You left your hair tie in my apartment. It's on the couch. I'm keeping it hostage until you come back.

I stare at the message, reading it over and over. It's the kind of thing someone says when they're not ready to let you go. When they're willing to use whatever leverage they have to keep you tethered to them.

It's also the kind of thing that makes my heart do something complicated in my chest.

Sophie leans over to read the text and grins. "Oh, he's good."

"He's manipulative," I say, but I'm smiling despite myself.

"Maybe," Sophie agrees. "But he's also interested in keeping you around. That's not nothing."

I don't respond to the text. Instead, I set my phone face-down on the couch and pour another shot, trying not to think about cedarwood and smoke and the feeling of his hand against my face.

Trying, and failing, to convince myself that I'm still in control of this experiment.

Because the truth is, somewhere between his apartment and this couch, the experiment stopped being about data and started being about survival. Not survival in the sense of staying alive, but in the sense of staying whole. Of not shattering into a thousand pieces the way my mother did.

And I'm terrified that I'm going to fail.

My phone buzzes again. Another text from Marcus: I'm patient. But not infinitely.

Sophie looks at me with those warm brown eyes full of something that looks dangerously like hope.

"He's right, you know," she says. "You can't run forever."

"Watch me," I say.

But even as I say it, I know she's right. I know that eventually I'm going to have to go back to that apartment. I'm going to have to face what's happening between us and decide whether I'm brave enough to let it be real.

And that terrifies me more than anything else ever has.