Chapter 88 STEP SISTER'S SECRET
STEP-SISTER’S SECRET (G×G)
LENA TUMBLER (FL) - 19YRS
CASSANDRA ACER (FL) - 29YRS
LENA
I never meant for it to happen.
Mom and David had only been married six months, and already they were off on another “business trip” — this time to Europe for two whole weeks. The house felt too big without them, too quiet. I was nineteen, home from my first year of college, and suddenly alone with her.
Cassandra. Cass. My new step-sister.
She was twenty-nine, ex-military, built like she could break you in half and make you thank her for it. Short-cropped dark hair, sharp jaw, arms corded with muscle and covered in faded tattoos from her deployments. She ran her own private security firm now, worked weird hours, came and went like a shadow. We barely spoke — polite nods at breakfast, maybe a “pass the salt” at dinner when our parents were home.
But I noticed her. God, did I notice her.
How could I not? She moved with this quiet authority that made my stomach flip. The way her tank tops clung to her broad shoulders when she worked out in the garage. The low rasp of her voice when she took calls in the middle of the night. The scent of her — clean sweat and gun oil and something dangerously feminine.
I’d always known I liked girls. College had confirmed it in stolen kisses at parties and late-night dorm explorations. But Cass? She was forbidden on every level. Step-sister. Ten years older. Intimidating as hell.
Still, I couldn’t stop fantasizing.
Tonight was bad. I’d waited until I was sure she was asleep — it was past midnight — then locked my door and slipped under the covers with my laptop. The porn was loud in my headphones: two women grinding together, slick and desperate, moaning like they couldn’t get close enough. My hand was between my thighs, fingers circling my clit in tight, frantic motions. I was soaked, thighs trembling, so close—
The door opened.
I froze, heart slamming against my ribs. Cass stood in the doorway, backlit by the hall light, wearing nothing but black boxer briefs and a sports bra. Her eyes — steel gray and unreadable — took in everything: the glow of the screen, my hand still trapped between my legs, my flushed face.
“Door wasn’t locked properly,” she said, voice low and calm. “Heard noises. Thought you might be in trouble.”
I yanked the blankets up, slamming the laptop shut. “Get out! Oh my God, Cass, get out!”
But she didn’t move. She stepped inside and closed the door behind her, leaning against it. Her gaze flicked to the laptop, then back to me. “Lesbian porn, huh? Interesting choice, little sister.”
The word sister hit like a slap and a caress at the same time. Heat flooded my face — and lower.
“I’m sorry,” I whispered, mortified. “Please don’t tell Mom.”
Cass tilted her head, studying me like I was a puzzle she’d just decided to solve. Then she crossed the room in three silent strides and sat on the edge of my bed. The mattress dipped under her weight.
“Tell Mom?” she repeated, voice dropping even lower. “No. But secrets have a price, Lena.”
My breath caught. “What… what kind of price?”
She reached out, slow enough that I could have moved away, and brushed a strand of hair from my cheek. Her thumb lingered at the corner of my mouth.
“Show me what you were doing,” she said.
I stared at her, pulse roaring in my ears. “Cass—”
“Now, Lena.” It wasn’t a request. It was a command, delivered in that same calm, military tone that made my core clench involuntarily.
Trembling, I pushed the blankets down. My pajama shorts were pushed to the side, my fingers still slick. Cass’s eyes darkened as she took me in — my small breasts heaving under my thin tank, my shaved pussy glistening in the dim light.
“Touch yourself,” she ordered. “Like you were before I walked in.”
I hesitated, then obeyed, sliding my fingers back to my clit. The humiliation burned, but so did the arousal. Having her watch — having Cass watch — made everything sharper, hotter.
She leaned closer, voice a rough whisper. “Spread your legs wider. Let me see how wet you got watching those girls fuck.”
I whimpered, opening for her. My fingers moved faster, circling, dipping inside just enough to make obscene sounds.
“Good girl,” she murmured, and the praise went straight to my clit. “You’re dripping, Lena. Such a needy little thing.”
“Please,” I gasped, hips rocking. “Cass, I—”
“Not yet.” She caught my wrist, pulling my hand away just as I teetered on the edge. I whined in frustration, thighs shaking.
She brought my fingers to her mouth and sucked them clean, eyes locked on mine. The sight of her tongue swirling around my wetness nearly made me come untouched.
“Sweet,” she said. “But you don’t get to come until I say. Understand?”
I nodded frantically.
She released my wrist and stood, towering over me. “Tomorrow night. My room. Ten o’clock. Wear something easy to take off.”
“Cass—”
“That’s an order, little sister.” She turned to leave, pausing at the door. “And Lena? Don’t touch yourself again until I tell you. If I find out you disobeyed…” She let the threat hang, delicious and terrifying.
The door clicked shut behind her.
I lay there panting, aching, more turned on than I’d ever been in my life. My step-sister had just caught me masturbating to lesbian porn — and instead of disgust, she’d taken control.
And God help me, I couldn’t wait for tomorrow.