How I Became Big Sister's Sex Slave

Again that soft, throaty chuckle. "Good boy, you learn fast. Go ahead Brian, suck your big sister's titties, make me feel good." She leaned forward and pressed her tits against my face and slid them back and forth as I sucked first one then the other hard nipple into my mouth, swirling my tongue around it, tasting the musky sweet flavor of her pussy. After a few minutes of this Karen pulled back slightly, positioning herself so that she was straddling my waist, holding her pussy just above my hard and throbbing dick. "What else do you want, little brother? Do you want to fuck me? do you want to feel your sister's hot, wet pussy sliding up and down your shaft, squeezing it, making you cum? Is that what you want?" Karen whispered.

"GOD!! YES, YES!!" Tugging uselessly at my restraints, I bucked with my hips trying desperately to plunge my cock into her hole.

Smiling, Karen slapped me gently across the face. "Who's in control here?" she demanded.

"You are, Karen."

"That's right. You'll do whatever I want, whenever I want, won't you little brother?"

"Yes, yes, I swear Karen, I'll do anything you want, just please fuck me."

She laughed softly. "That's better, Brian. I love to hear you beg, it turns me on. Say, 'Mistress Karen, please fuck me and make me cum.'" I hesitated for a moment, staring up at her. "Beg for what you want little bro, and I'll give it to you."

I was so turned on by Karen's aggressiveness, her total dominance, that I would have done anything she said. "M-mistress Karen, uh, please fuck me and, uh, and make me cum," I stammered in a low whisper.

"Mmmmm, that's a good little slave." Karen slowly eased herself down onto my cock, sliding down my shaft until I was completely buried in her hot, wet tunnel. The sensation was exquisite and I moaned deep in the back of my throat, trying desperately to keep from cumming right then and there.

Karen whimpered softly and began sliding up and down on my cock , riding me faster and faster until she was slamming up and down, balancing herself with both hands pressed against my chest as she fucked me, her ass grinding down against my balls with every stroke. "Ohhh, Brian, that feels sooo good!!" she panted. "YEAH, FUCK ME!! You're fucking your own sister you nasty little slut! Do you like it? Does it feel good?"

I was totally in bliss, the feeling of my sister's tight slippery twat riding me, devouring my cock, was amazing. "Yeah, God yeah! Oh shit Karen fuck me harder! please!"

Karen was riding me furiously now, impaling herself on my hard shaft as deeply as she could with every stroke, panting, her head thrown back, her huge tits quivering as she fucked me. "Yeah little brother, that's so good, so fuckin' good! Make me cum, uuunhh, yeah, oh god, oh shit, I'M CUMMING!!!" With a scream she thrust down on me completely and I could feel the walls of her pussy contracting as she came, flexing around my cock, milking it.

"Oh Fuck, Karen, I can't hold back, uuuhn, AHHH! I'm gonna cum!"

Karen leapt off of me and, grabbing my still pistoning cock with her hand, she aimed it directly at her chest. "Yeah bro, shoot that hot load, I wanna watch you shoot your jizz all over my big titties!"

She stroked my cock twice and I was gone. "AAAAHHH!" Cum erupted from my cockhead in three long spurts, coating my sister's tits, dripping from her nipples. I fell back against the bed, hanging limply against my restraints, exhausted, totally spent. Karen rubbed my cum all over her breasts, massaging it into them. Using both hands she then scooped up all of my cum from her chest and lapped it from her fingers, swallowing every drop.

"Mmmm, you taste delicious little brother." She untied my wrists and lay down beside me, snuggling close. Kissing me on the cheek she whispered, "Better rest up Brian, this is just the beginning. Remember, you promised, 'anything I want,' right?"