Step Sister

Chapter 1

couldn't believe what she was doing, I watched, rubbing my hard cock. My step sister, standing in front of her enormous mirror, her skinny jeans look like they're about to pop. She's obviously turned on, letting out the occasional uncontrollable lusty moan. Her breasts have gotten huge since senior year, she barely squeezed them into a white button up. I watched as she became too aroused to continue to force the buttons closed. Her hand rubbed her pussy through the tight skinny jeans. "you fat cow" she whispered, her face turning red as she began to stuff her face with tastycakes as quickly as she could. I couldn't stop myself from jerking off as I watched her loose control through the crack of the unlatched door.
She moaned as she gulped down the sixth one bursting the seam in her crack. Her swollen wet pussy oozing about to drip, her swollen lips hung out of her tight denim ass. I had to stop to keep myself from finishing, she barely slowed down to breathe. I never felt my cock so hard, veins bulging as it throbbed. I knelt on my knees in the hallway, holding my throbbing member. I watched as she began to ride an average dildo through her torn jeans. She was completely lost in her own world, stuffed belly swollen her shirt riding up. I watched her eat another and another. Rubbing her pregnant looking stuffed gut, She taunted herself. "you're going to get fat you slut" she began riding the dildo harder, I could see her wet pussy throbbing as she stuffed another tastycake down. Followed by two more without hesitation. I think this would have been considered torture.
Her moans gave me an opportunity to sneak in and slide under her, and she impaled herself on my signifgantly larger cock. She gasped her eyes popped open, her tight pussy clenched and throbbed on my hard cock. "God you feel so much better than I ever thought you would" I groaned as I began pounding her from behind, watching her new fat jiggle and bounce as she moaned in time with my balls slapping her big clit. I could tell she's been doing this for a while and hiding it. She was a thick girl, she knew what to wear to look thin. But her ass and tits were always impossible to keep your eyes off. Her ass was huge, her back fat hung over onto her jeans. Her stomach was as big as an excersize ball, stuffed full as can be. She got on all fours letting me take her, so I did. "you're so tight and wet...you feel so amazing!" I thrust deep and forced it in deeper than she expected, my balls slapping her clit. I was so close, but i didn't want to stop fucking her, "I think someone's going to pop" I stuffed a tasty cake in her mouth, muffling her slutty moans that escalated as her pussy milked me as I used her as my cum dump. I slapped her ass hard, her shirt buttons popping off one at a time. Her udders bouncing in time with her moans. Her heifer nipples hard and leaking milk. I squeezed her wide fat hips and thrust into her like a piston, I could feel she was about to pop. Her pussy throbbed and squeezed, harder and harder, eagerly milking me. I slowed down, she wants me to breed her, she cant control herself. I thrust deep into her, probing her cervix slowly. Her moans were completely unrestrained, pussy milking me as she came. I pushed a little bit more and her cervix pulled me right in. I teased her, slowly fucking her cervix. I felt her orgasm intensify, squeezing and throbbing against my rock hard cock. She was still slowly grazing on tasty cakes. I slammed deep into her a few times, quickly and hard to spank her clit with my big balls and pound her womb to make her pop again. Slowly thrusting as she orgasmed, she was almost screaming from pleasure. I needed to cum too, but she was going to get us caught. I shoved another tasty cake in her mouth, I'm going to cum in her, join her. I force another, then another, she struggles to swallow them, gagging, still climaxing. 5 down , 6, 7, 8, Orgasming as I pull her hips tight against mine, pressing deep her cervix as I feel every spurt of sperm filling her. I moan filling her fertile 21 year old pussy with my sperm. "That's so fucking hot Meg, you're so fucking fat." I kept thrusting slowly, her pussy still throbbing, quivering from the best orgasms she's ever had. She's still recovering from being force fed.
I helped her lay down without pulling out. I asked her how much she weighed now, "almost 300 lbs" she turned bright red.
"I think I might have to keep fucking you now." I told her, and her pussy instantly complied, squeezing my rock hard cock "I love big girls." She got shy, "I'm sorry, I love obese fat whales, like monstrous , I like them waddling, out of breath, covered in fat rolls, that jiggling ass that moves like a wave" She was milking my cock with her pussy again. She didn't speak, I knew she was turned on by her reaction. I kept fucking her, watching her fat shaking with every thrust. "I love watching them pig out until they're exhausted and out of breath" her pussy throbbed, " until they cant get up, or even consider...trying to..." She let out a little whimper of frustration and lust "you wish you were my little cow don't you?" Her pussy began milking me harder than before
"you know you're starting to waddle almost all the time now heifer" She began fucking herself on my throbbing cock that was already about to shoot another fertile load into her.
"careful you'll be octomom at this rate" I taunted her, I could tell she loved it her tight cunt pulled me in deeper. "you'd love that you fucking breeder" she was about to orgasm again, I grabbed her enormous wide hips, pounding her hard like a piston. My big balls slapped her clit harder with every thrust. She put her hands over her mouth but she couldn't hold back, her pussy pulled me in deep, milking another heavy load into her cervix. I moaned watching her ass shaking as she struggled to finish the intense climax. "milk me you little slut, impregnate yourself that's it. You're going to get so big and hot"
The floor squeaked in the hallway, dad was up. I immediately threw my hand over my stepsisters mouth. Her nude fat pressed against my skin, made my cock throb still in her cum filled cunt. I bent her over, admiring her plumped up body. Her hips stuck out a foot on each side, I pulled them closer to me. My cock throbbing as my balls hugged her clit. The footsteps in the hall went back to the master bedroom. I took my cue to start thrusting slowly.