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I land a blow on the other ass cheek. Her fair skin reddens and forms an outline of my hand.

She’s your fucking sister.

“Ryder!” she shrieks.

I land another blow and rub the same spot to soothe the sting. Madison’s squirming lessens, and she grunts with each spank until little whimpers escape her. My breathing quickens as desire licks at every nerve ending in my body. It won’t take much more to make me come in my pants, and I don’t care if it happens.

It’s her fault.

It’s all her fucking fault.

I roughly squeeze her ass and hook my thumb between her cheeks to creep closer to her back hole.

It won’t hurt anyone if I finger-fuck her. She clearly wants me.

Madison whines and shoves her hips backward to push more of her ass into my hand.

She’s your sister.

The lust-haze clears enough for me to realize what I’m doing and how wrong this is. I jerk my hand away, then swing it back down to connect with her ass.

How dare she tempt me when I’ve fought this hunger for her for years. How dare my stepsister come into my space, dressed in a skirt with no underwear on, and pester me like I wouldn’t do anything. How dare she reveal these awful and confusing feelings inside me.

I’m not Jaxon. He’s never tried hiding his attraction to his sister, and he’s never cared what people thought, but I give a fuck about crossing lines.

I’d ruin Madison. I’d taint her with the darkness inside me and the need to own her. To hurt her. To punish her. To make herscream. I’d use my sister as a fuck doll until she ran from my room in tears. Doesn’t she get it? I’m not good for her.

“You don’t want this, doll,” I say through clenched teeth.

“Please, Ryder!” she cries.

My cock jerks at her pathetic sobs.

I’m at the edge of my orgasm, and all I need?—

Madison wiggles against my erection in a weak attempt to get away from me.

“Fuck,” I snarl.

My muscles contort, and I pant through the climax. Warm jets of cum shoot from the tip of my dick and dampen my pants. Bliss fogs my mind, and I ride the high.

Madison squirms on my lap, unaware of what happened. I slide my hand between her ass crack and brush my fingertips over her back hole. I pause when I reach a smooth texture that isn’t skin, then spread her ass apart, exposing her hole to my greedy eyes.

“Fuck,” I rasp. The end of a bright-pink butt plug lodges snugly at the entrance. “Why the hell do you have that in you?”

“None of your business.” Madison trembles and pants. Her thighs squeeze together to hide the toy.

I click my tongue and stop her by shoving her legs apart.

“Let go of me!” she yells.

I pinch the toy’s flat edge and wiggle it. A choked sound slips from Madison, and her back arches. Her ass pushes further into the air and into my hand.

It seems my little sister isn’t as innocent as I thought.

My gaze lowers to her pussy. Thick arousal glistens on her folds, and my softening cock twitches as all the blood in my body rushes back to it. I would give anything to touch her cunt. It would be so easy to sink two fingers inside her and make her scream my name. It’d be easier to make her come so much she’d forget her own.

She’s your sister!