Chapter 1
The first pale light of morning filtered through the thin curtains, soft and gray. Stiles lay still for a long moment, listening to the quiet rhythm of Hope's breathing beside him.
They had fallen asleep the way they always did lately—close, tangled without quite meaning to be. The twin mattresses had been pushed together months ago when the spare room got turned into storage, and neither of them had ever bothered to push them back apart. It had started as practicality. It had stayed as something else.
Hope slept on her side, facing away from him, one arm curled under the pillow. The sheet had slipped down during the night, leaving the smooth line of her back and the soft curve of her hip bare. Her hair—dark, a little messy—spilled across the pillow. She looked younger like this, quieter than she ever was when she was awake. The same girl he had grown up with. The same face he had watched change year after year in the same house, the same school, the same everything.
Stiles had always known.
He had known when they were kids and she was just his sister who ran faster than him and laughed louder. He had known when they were teenagers and every other girl in the world felt like static compared to the way she moved through a room. He had known every time she leaned against him on the couch, every time she stole his hoodie, every time she looked at him like he was the only person who really understood her. He had never said it. He had never planned to.
But this morning something inside him simply… gave.
His hand moved before he fully decided to move it. Fingers brushed the warm skin of her shoulder, tracing the faint freckles there. She didn't stir. He let his palm slide lower, slow, following the dip of her waist, the rise of her hip. The sheet whispered under his touch. Her skin was soft. Familiar. Forbidden in a way that made his pulse thud hard in his throat.
He shifted closer. The mattress dipped. His chest brushed her back. He could smell the faint trace of her shampoo mixed with sleep. His fingers found the edge of the sheet and eased it down another inch. The soft curve of her breast came into view, the nipple still relaxed in the cool air. He stared for a long second, then touched her there too—light, almost reverent at first, then firmer when she still didn't wake.
A soft sound left her, half a sigh. She shifted, pressing back into him without waking. The contact made his cock harden against the thin fabric of his boxers. He pressed forward, letting her feel it, and his hand slid lower still, over the soft plane of her stomach, down between her thighs. She was warm there. Soft. He cupped her, slow, learning the shape of her through the thin cotton of her underwear.
Hope made another small sound and turned her face deeper into the pillow. Still asleep. Or almost.
Stiles's heart was racing now. He didn't know what the hell he was doing—only that stopping felt impossible. He hooked a finger under the edge of her underwear and pulled it aside. His fingertips brushed bare skin, slick already somehow, and he exhaled shakily against the back of her neck.
"Fuck," he whispered, so quiet it barely counted as sound.
He rubbed her gently, circling, feeling her body respond even in sleep. His other arm slid under her, pulling her tighter against him so he could feel every inch of her back against his chest. He rocked his hips once, slow, letting the hard line of his cock press into the soft give of her ass. The friction made his eyes half-close.
Hope's breathing changed. A little deeper. A little uneven. Her thighs shifted, opening just enough that his fingers could slip more fully between them. He found her entrance and pressed one fingertip inside—just the tip—feeling the tight heat of her. She made a soft, confused noise and pushed back against his hand like her body already knew what it wanted even if her mind was still somewhere else.
Stiles's mouth found the side of her neck. He kissed her there, open and slow, tasting sleep-warm skin. His finger slid deeper. A second joined it. He worked her carefully, curling, listening to every tiny sound she made. His cock ached, trapped between them, leaking against the fabric.
He didn't know how far this would go. He only knew he couldn't stop yet.
Hope's eyes fluttered. She made a small, sleepy sound of protest that turned into something else when his fingers pressed deeper and his thumb found her clit. Her hips rolled once, instinctive.
"Stiles…?" Her voice was rough with sleep, confused, not quite awake.
He didn't answer with words. He just kept touching her—slow, deliberate, like he had all the time in the world and none of the guilt he should have felt. His free hand came up to cup her breast, thumb brushing over the nipple until it tightened under his touch.
Hope's breath hitched. She was waking up properly now, body still soft and pliant against him, but her mind catching up to the fact that her brother's fingers were inside her and his cock was hard against her ass and nothing about this was accidental.
For a long moment she didn't move. Didn't speak. Just breathed, feeling everything.
Then, very quietly, she whispered his name again—not a question this time.
And she didn't pull away.