"Gonna be honest, little Willy. I didn't expect you to get this small. Most things I read online said this should've only made you about doll-sized. Maybe you having a futa mom makes the effect stronger. Anyway, I've got plenty of fun ideas." She cooed. It did little to ease your concerns, but she seemed either oblivious to them or simply didn't care. Her hand tilted, forcing you on all fours and scrambling for grip as she giggled.
"Come on, don't leave Big Willy waiting."
Her hand kept tilting until you lost your grip, tumbling through the air for a moment before you hit the slimy surface of her dick. The large tip was coated in a thin film of pre, making it impossible for you to do anything but hope that she would go easy on you. Your limbs slip on the slickened surface and you fall onto your belly. You feel yourself slowly sliding down the side, unable to find any grip on the smooth cockhead. Kim giggled, watching you slip and slide on her tip, her dick twitching with excitement.
"I'll give you a hand." She mused, hovering her large palm over you before gently bringing it down. Even with her gentle approach, the pressure was unrelenting. She mashed you into the spongy flesh of her tip, moaning loudly as you squirmed and stimulated it. The intense stench of sex filled your nostrils and addled your brain. Soon your own dick was starting to react and her sensitive tower effortlessly picked up on it.
"Ooooooh. See, I knew you would like it." She said, smiling and lifting her hand. She picked you up before you had a chance to even move and pinched you between two fingers. Her other hand came in and crudely tore your pajamas off, leaving you blushing brightly, trying to cover up. She didn't seem to care much what you were doing, simply dropping you back on her dick and rubbing you into the tip. Slowly her movements began to align you with the large slit, sliding you over it until your dick slipped inside. It wasn't too difficult. At your size the slit was like an open manhole cover. But your little man didn't get the memo, eagerly growing rock hard. Whenever it rubbed against the inside of Kim's urethra you had to stifle a moan yourself. An easy feat given how her bellowing moans would drown yours out anyway. But the last thing you wanted was to give her the idea you were into this too.
"You're so cute and small." She cooed inbetween moans. Were you not pinned down under her hand you would've seen the gears in her head turn. She'd only imagined doing this in her wildest dreams, but maybe he was small enough to actually pull this off. With restraint she began to rub you against her hardening cockhead again, dragging you around. If your body wasn't soaked in pre yet, it would be now, more of the clear slime bubbling up from the depths of her shaft. You could only hope this was enough to make her reach a climax soon. You were beginning to feel sore all over. But nothing could've prepared you for what Kim said to you next.
"Mmmmm, I think Big Willy is hungry..." She said, the sentence degrading into a soft moan. Did you hear that right? Did she just refer to her cock as hungry? It was then that you realized she'd been rubbing you until your legs were together and aimed straight at the large slit. In one horrifying motion she dragged you towards the hole and pushed your legs inside. The living tunnel around your legs squeezed a little, accepting the new occupants and ensuring you were stuck. Her hand lifted and you cried out to her.
"Kim! Stop! Don't do this! I'm your brother!"
Her expression was one of malice and lust as she gave you a chilling answer. "I'll get you out soon enough, little Willy, but right now Big Willy is gonna eat."
She'd barely finished the sentence when the tunnel opened up and you felt yourself sinking in a little further, your waist entering the passage. You held out your arms to stop your descent, but the smooth surface around the slit was covered in so much pre not even an ice rink would be this slippery. With each millimeter of you sinking into into her dick Kim moaned louder. How long until the neighbors would start complaining about the volume? The slit had devoured most of your torso, your arms giving one last desperate attempt to keep her from swallowing you up completely. But against her huge dick your efforts were meaningless. With a wet squelch it broke through your resistance and pulled you in. You cried for help one last time, but the only assistance that came in was her hand massaging her cock to ease your descent inside.
"Oh, this is so good." She said, gasping and moaning as she felt her little brother sink down into her shaft. His every twitch and squirm sent waves of pleasure through her.
From your position inside her dick pleasure was just about the last thing that came to mind. The narrow tunnel seemed unending, carrying you deep down her massive cock. Of all the things that could happen today, being shrunk down and fed to your sister's colossal dick was pretty damn low on the list. You could only pray that she was honest about letting you out again before anything bad could happen to you in here. The walls were coated in a thick layer of pre, splotches of cum dotted within. The smelly slime clung to you, adding to your discomfort. No amount of cleaning would ever wash away this nightmare.
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