Sinfully Yours StepDaddy

Chapter 4

Sienna could not look her mother in the eye.

They sat across from each other at the kitchen island that afternoon, her mother scrolling through her phone while Sienna pretended to eat the sandwich she had no appetite for. Every time her mother laughed at something on the screen, guilt slid cold and sharp under Sienna’s skin. The same skin Roman had put his mouth on less than two hours earlier. The same body that still carried the ache of him.

She kept seeing flashes. His hand over her mouth. The way the desk had creaked. The look in his eyes when he told her she was playing a game she did not understand. She had understood. She just had not cared enough to stop.

“You’re quiet today,” her mother said without looking up.

Sienna forced a small smile. “Just tired.”

“Maybe you should rest. You’ve been staying up too late.”

The words landed heavier than they should have. Sienna nodded and stood, carrying her plate to the sink even though she had barely eaten. Her hands shook slightly under the running water. She hated the shaking. She hated how much she already wanted the night to come so she could feel him again.

Roman passed through the kitchen a few minutes later. He did not speak to her. He only rested his hand on the small of her back for the briefest second as he reached past her for a glass. The touch was light, almost casual, but it burned through her clothes like a brand. Her mother never looked up from her phone.

That single touch stayed with Sienna for the rest of the day.

By evening the house had settled into its usual quiet rhythm. Her mother disappeared upstairs with a glass of wine and a book. Roman stayed in the study. Sienna tried to read in her room. The words blurred. She kept glancing at the door she had left unlocked again.

She told herself she would not go to him tonight. She told herself she needed distance, needed to remember who she was and what this would cost if they were caught. She lasted until just after midnight.

Then she was standing outside the study again, heart in her throat.

The door opened before she could knock. Roman stood there in the low light, shirt unbuttoned at the collar, eyes dark. He did not look surprised. He looked like he had been waiting.

“Come in.”

She stepped inside. He closed the door and locked it. For a moment neither of them spoke. The silence felt heavy, almost painful.

“I kept telling myself I wouldn’t come,” Sienna said quietly.

“But you did.”

“I can’t stop.”

Roman crossed the room and stopped in front of her. He did not touch her yet. “Do you want to stop?”

She should have said yes. The word was right there on her tongue, heavy with everything she knew was right. Instead she shook her head.

“No.”

Something in his expression shifted. He reached out and brushed his knuckles down the side of her neck, slow and deliberate. “Then stop fighting it.”

He kissed her. It was slower than the nights before, deeper, almost careful at first. Then it turned hungry. His hands slid under her sleep shirt, palms warm against her bare skin, and she arched into him without thinking. He walked her backward until the backs of her thighs hit the edge of the couch. She sat. He followed, settling between her legs, mouth never leaving hers.

Clothes came off in quiet, urgent pieces. When he finally pushed into her it was with a low sound that seemed to come from deep in his chest. Sienna wrapped her legs around him and held on. Every thrust felt like it was rewriting something inside her. She kept her eyes open, watching his face, memorizing the way he looked at her like she was the only thing in the world that mattered in that moment.

Afterward they stayed tangled together on the couch, skin cooling, breathing slowing. Roman’s hand rested on her hip, thumb tracing idle circles. The quiet felt different now. Softer. More dangerous.

“I hate how much I want this,” Sienna whispered into the dark.

Roman was silent for a long time. When he spoke his voice was rough. “I know.”

“She’s my mother.”

“I know that too.”

Sienna turned her face into his shoulder. “What happens when this ends?”

He did not answer right away. His arm tightened around her. “Who said it has to end?”

The words settled between them like a live wire. Sienna lifted her head to look at him. His expression was serious, almost hard.

“You can’t mean that.”

“I don’t say things I don’t mean.”

Before she could respond, a soft sound came from the hallway. Footsteps. Slow. Careful.

Both of them froze.

The footsteps paused right outside the study door.

Roman’s hand covered Sienna’s mouth instantly. His body went completely still above hers. She could feel his heart beating hard against her chest. The silence stretched so long it hurt.

Then the footsteps moved on, fading toward the stairs.

Only when the house went quiet again did Roman slowly lower his hand. He looked down at her, eyes sharp.

“She almost heard us,” he said, voice barely audible.

Sienna nodded, throat tight.

Roman brushed her hair back from her face, his touch gentler than his expression. “We need to be more careful.”

“I know.”

He kissed her forehead once, then sat up and reached for his clothes. “Go back to your room. Now.”

Sienna dressed quickly, legs still unsteady. At the door she paused and looked back at him. He was already watching her.

“Roman.”

“Yes.”

She almost told him she was falling for him. The words pressed against her teeth, heavy and terrifying. Instead she only said, “I don’t think I can stop.”

Something raw moved through his eyes.

“Then don’t,” he answered. “Just don’t get caught.”

Sienna slipped into the hallway and closed the door behind her as quietly as she could. She made it to her room and locked it this time, back pressed against the wood, heart still racing.

She stood there for a long time, staring at nothing, the weight of his words and the near discovery sitting heavy in her chest.

Outside, the house was quiet again.

But Sienna knew the quiet would not last.