Our parents got married in June. By July, they decided we needed “bonding time.” They converted the guest room into a home office and informed us—over pancakes, like it was nothing—that we’d be sharing my bedroom for the summer.
“You’re both adults,” my mother said, smiling like she’d solved world peace. “It’ll be like a sleepover. Every night.”
Riley—my new stepsister, my father’s new wife’s daughter, the blonde bombshell who’d been destroying my concentration since the wedding—looked at me across the breakfast table. Her expression was unreadable. But her foot, under the table, brushed mine.
Just once. Just barely. Just enough.
That was how it started.
The first week was torture. Sharing a bathroom mirror while we got ready. Brushing our teeth side by side. The way she slept in my oversized t-shirts that covered exactly nothing, the way she tossed and turned in the bed three feet from mine, the way she sighed in her sleep like she was dreaming about something she couldn’t have.
The second week, I found her underwear in my laundry. Accidentally, she said. But the lace was black, and the size was wrong for me, and the way she looked at me when she took it back made my mouth go dry.
The third week, she started showering at midnight. Every night. The bathroom attached to our bedroom would run, the steam would seep under the door, and I’d lie in bed staring at the ceiling, imagining her wet and naked and just feet away.
Tonight, she appeared in the bathroom doorway at 12:47 AM. Steam billowed behind her like she’d brought a piece of a cloud with her. Her white t-shirt—the one that had been mine before she’d claimed it—clung to her damp skin, transparent in places that made my breath catch. Wet hair dripped onto her shoulders, tracing paths down her chest, disappearing into the fabric.
One hand rested on the doorframe like she needed it to stay standing. Like she was as unsteady as I felt.
“Our parents think we’re bonding,” I whispered from my bed. My voice was rough, broken, completely unlike the polite stepsister I’d been pretending to be. “They have no idea.”
She didn’t speak. Riley rarely spoke in the dark. She just bit her lower lip, her eyes dark and endless in the soft lamplight, and she looked at me like I was the answer to a question she’d been afraid to ask.
I stood up. My camisole was black lace, barely there, completely inappropriate for a family sleepover. I walked over to her, each step feeling like I was crossing an ocean, a desert, every boundary I’d ever known.
I stopped close enough to smell her shampoo. Coconut. The same brand I used. The one I’d bought for the guest bathroom before I knew she’d be using my shower, sleeping in my room, destroying my life with her presence.
“Tell me to go back to my bed,” I whispered. My hand found the doorframe beside hers, our fingers inches apart. “Tell me this is wrong. Tell me to stop.”
She reached out. Her hand found my camisole strap, her fingers sliding under the lace, and she pulled me into her with a force that made me gasp, made my knees buckle, made every wall I’d built come crashing down.
Her mouth was hot and desperate and completely forbidden. She tasted like mint toothpaste and steam and the exact moment when a secret becomes inevitable. Her hands slid under my camisole, finding my waist, my ribs, and I was already lost when—
The bedroom door handle turned.
We broke apart, breathing hard, our faces flushed, my camisole twisted, her t-shirt riding up. The door opened. Our mother’s head appeared, silhouetted against the hallway light.
“Girls?” she asked, her voice sleepy and innocent. “I made hot chocolate. Want some?”
Riley didn’t panic. She just pressed me back against the bathroom door, her body shielding mine from view, her mouth finding my ear.
“Tell her we’re fine,” she whispered, her breath hot against my skin. “Tell her we’re bonding.”
I opened my mouth. Tried to speak. But Riley’s hand had found its way back under my camisole, her fingers pinching my nipple with a precision that made my voice break.
“We’re—” I started, my voice shaking. “We’re good, Mom. Just… bonding.”
“Okay, sweethearts,” our mother said, completely unaware. “Sleep tight.”
The door closed. Riley turned back to me. Her eyes were dark, her smile was dangerous, and her hand was still burning against my breast.
“Now,” she whispered, “where were we?”
She showed me. For hours. In the bathroom, against the sink, the mirror fogging with our breath. In my bed, her body covering mine, her mouth everywhere, her name breaking from my lips like a prayer I hadn’t known I knew. She made me come with her fingers, with her tongue, with her whispered promises that this was only the beginning.
At 4 AM, she finally slept. In my bed. Her head on my chest, her hand on my stomach, her breathing slow and even.
I stared at the ceiling, listening to her sleep, and I knew—I absolutely knew—that our parents had created the exact thing they’d been trying to prevent.
We weren’t bonding. We were burning.
And I never wanted it to stop.
