It wasn't fate that led Yeonjun to her. It was obsession. Your eighteenth birthday was supposed to be just another day. But it wasn't. Not when they all looked at you like you were something to finally claim. Yeonjun's gaze burned into you all night, and when you wore the dress Soobin picked out for you, it felt like you were stepping into something you couldn't escape. Their smiles were different now. There was no pretending anymore. Beomgyu dressed you in soft lace, his hands lingering too long on your skin. Taehyun's quiet voice told you, "Now you're ours." You smiled because you didn't know how not to. You were finally going to be theirs. Completely. And they made sure you knew it. There was no going back. You were no longer the little girl they raised. Tonight, you were going to learn what it meant to be theirs, truly, fully.

When she came down the stairs that night, they all stopped breathing. She wore the nightgown Soobin picked, silk, short, white as untouched snow, clinging to every curve they'd tried not to stare at for years. The straps slid off one shoulder. The hem rode up every time she took a nervous step. She looked unsure. Like she didn't know what she was doing. Which made it even worse.

"Happy birthday," Kai said first, voice shaking as he stepped forward. His eyes were blown wide, dark with too much feeling. "You look... you look really beautiful."

Beomgyu chuckled low, eyes already tracing the soft skin of her thighs. "You sure you didn't turn twenty-one instead? Because I don't think eighteen should look like that."

Taehyun was quieter. His gaze sharper. "Did you wear that for us?" he asked simply. And when she didn't answer, just looked down with flushed cheeks and bare legs trembling, he smiled.

"You did."

She didn't know where to look. She never did when they were like this. Too close. Too hungry. And tonight, it wasn't masked by innocence anymore.

Yeonjun didn't speak at first. He just stared from across the room, hands clenched at his sides. He had dreamt of this for years. Had imagined this scene in endless variations, her walking in, wearing something sinful, still soft, still his. Eighteen and finally reachable.

But reality was worse.

Because the second she walked in, his self-control shattered.

"Come here," he said quietly.

She looked up at him, startled, still holding the hem of her dress.

"I said, come here."

She obeyed.

Of course she did.

Yeonjun pulled her gently between his legs, sitting her on his knee like a child. His hands slid along her bare thighs, then up her waist, settling just below the swell of her breasts. He kissed her temple, soft and slow and aching.

"You're not our baby anymore," he whispered, lips dragging along her ear. "But we still raised you. We still made you. You belong to us."

She didn't speak. Just trembled in his hold.

He could feel her heartbeat, racing. Terrified. Aroused.

"Tonight," he murmured, "you learn what it means to be ours."

They let her go after cake. After gifts. After Yeonjun kissed her cheek one last time and told her, "You'll find him waiting upstairs."

The hallway was dark.

The air felt thick.

She opened the bedroom door, and found Kai already sitting on the edge of the bed, shirtless, fingers twisting nervously in his lap.

"Hi," he said, voice cracking. "Sorry. I—I wanted it to be me."

She didn't answer. Her breath hitched.

Kai stood slowly. Crossed the room like he was afraid to scare her off. He reached for her hands, then pulled her into him, wrapping his arms tight around her body, burying his face into her neck.

"I missed you," he whispered. "Even though you were right there all night. I kept thinking about this. About you. In that dress. In my bed."

She tried to pull back, but he just held her tighter.

"I love you," he breathed. "So much it hurts."

His lips ghosted down her neck. His hands slid lower, over the curve of her back, brushing the tops of her thighs.

"Now that you're an adult," he whispered, "you need to experience what all adults do."

She trembled.

He felt it.

"It's okay," he said, kissing her collarbone. "I'll go slow. I know you're scared. But we've waited for this. You've felt it too, haven't you?"

He guided her back onto the bed, crawling over her like a prayer, like a curse.

"I promise I'll be good," he said, voice breaking with need. "But please, please let me be the first."