Chapter 17: The New Equation (Continued)

He anchored his hands on her hips and held the rhythm, watching her fall apart above him. It was the most beautiful thing he had ever seen—Wren unmade and remade by pleasure, her head thrown back, her body taut as a bowstring. When she came, she said his name like it was the only word left in the world.

The sound undid him. He followed her over the edge, his release rolling through him in long, shuddering waves, and he held her through all of it as if she were the only fixed point in a universe that had finally stopped obeying its own laws.

Afterward, they lay tangled together, sweating and breathing and saying nothing. The room was dark except for the streetlight slipping through the blinds. Marcus could hear Wren's heart slowing against his chest.

"Okay," she said finally. "You can categorize that."

He laughed, the sound vibrating through both of them. "I don't think I have a category for that."

"Make one."

"I'll need more data."

Wren lifted her head. Her hair was a mess, her eyes were bright, and she looked happier than he had ever seen her. "I'm willing to participate in longitudinal studies."

"Are you?"

"For science. And for you."

He kissed her forehead, her nose, her mouth. "I love you."

"I know. I love you too." She settled back against him. "How do you feel?"

"Like someone rewrote the equation and forgot to tell me the new rules."

"That's called being human, Marcus."

"I'm getting used to it."

They lay in silence for a while. Marcus stroked her back, counting her breaths the way he sometimes counted data points—except these were not data points. They were proof of life.

"Can I tell you something?" Wren asked.

"Always."

"I've had sex before. Obviously. But I've never been seen before. Not like that." She paused. "You look at me like I'm real. Not like I'm a fantasy or a problem or a puzzle. Just real."

"You are real." He held her tighter. "That's the only thing I'm certain of anymore."

Wren was quiet for a moment. Then she said, "I think I want to expand the practice."

Marcus blinked. "Now?"

"Not right now. Eventually. I've been thinking about it since you made the spreadsheet. About offering workshops. About teaching people to make their own threshold charms. About making what I do less hidden."

"That could make you a bigger target."

"It could." She propped herself up on one elbow. "Or it could make me less vulnerable. Daniel Reese found me because I was a mystery. Mysteries invite projection. If I'm open about what I do, there's less room for people to invent villains."

Marcus considered this. "You'd need a business plan."

"I know."

"I could help."

"I know that too." She smiled. "That's why I'm telling you."

He pulled her back down and kissed her hair. "Then we'll do it. Slowly. Carefully. With spreadsheets."

"With spreadsheets and charms."

"The perfect combination."

Wren laughed and tucked herself more closely against him. Outside, the city hummed its late-night song—cars and sirens and the occasional shout of someone who had not yet gone home. Inside, the threshold charm held the door, and the bed held them, and the future felt less like a problem to solve than a space to inhabit.

Marcus closed his eyes. For the first time in his life, uncertainty felt like comfort.

He slept, and did not dream of equations.