Scared but horny

Reality began again, and Ruth has ducked away under what she'd supposed was being thrown at her. Realizing that there was nothing, she looked back at Sara, holding her phone as a marksman holds their pistol, and continued with her questions, "Sara, What the fuck are you doing to mom?"

Sara's massive cock was still buried inside of their mother, who was still **** from the massive amount of orgasms and cum that had ravaged her body. Stirring her cock around inside of their mother's womb, Miriam moaned languidly, lost in bliss, before Sara withdrew her length. Miriam let out a quiet, if not sad, whimper, as Sara withdrew, a wet splattering of their mixed cum landing on the hardwood floors. Due to the changes she'd made to Miriam, no further liquid poured out of their mother, who merely rolled over and slipped out of consciousness.

"Oh, you know. Something that I've wanted to do for a very long time." Sara's cock stood between them, eighteen inches long and still turgid, dripping with their mother's juices and the fertile seed that now swam away to make both of them yet again big sisters, "Something I suspect you've wanted to do for a long time too." Holding her phone aloft, Sara flicked a button on the screen, and the door behind Ruth was suddenly shut. It didn't swing shut to slam. It was just suddenly closed, so sudden it made Ruth jump in surprise.

Ruth's eyes were only away from her sister's naked body for an instant, before returning to stare at that massive cock that was attached to her little sister. Now, last Ruth checked, she was the only person in the house who had a dick. Quaking with fear, Ruth backed away, before finding herself pressed against the door. Her eyes were wide, and her knees buckled as she slid down a little bit, demurely looking up at the massive tool that was attached to her sibling."S-Sara, where did you get that from?"

"Oh, this little thing?" Sara adjusted a slider on her phone, and her cock grew out, going from the immense but somewhat reasonable 18 inches to over twenty six inches long, longer than her arm, and as big around as her calf. "It's all part of a new toy I got. It lets me play around and have as much fun as I want. See?"

Ruth was curious about what sensation she was feeling for a moment, before she suddenly felt tight, before looking down to see that her breasts were inflating out of her tight and modest clothes, swelling from B cups to F cups, before bursting the fabric of her bra. Ruth let out a moan as her tits expanded rapidly, splitting the fabric of her tank top. With a smirk, Sara tapped a button, and Ruth suddenly felt like her belly was oddly more. Not that she was fat, or full, but that there was more to her. She was curious until she felt something open up within her, like the first drink of water when parched. It took her only a moment to realize not only was her little cock hard, but her brand new pussy was dripping wet inside of her jeans.

"You can change anything with your phone, can't you?" Ruth asked, her ass pressed to the ground in slight fear. She clutched her now massive tits to her chest, covering her nipples, the other arm between her legs, covering her shame between her legs.

"Oh Yes, anything, anyone, at any time," Sara said with a chuckle, before flipping a few more switches on her phone. The fabric of Ruth's jeans tightened suddenly, and looking down revealed that Ruth was swelling to have wide, bell-like birthing hips. There was a moment of pain, and suddenly Ruth's pants burst into shreds and tatters,leaving her in only the thin stretched cotton of her panties. Standing over Ruth, Sara held her cock aloft over her sister, a glob of forbidden cum falling to land with a wet splat on Ruth's cheek, "Now, Are you going to be a good little breeding slut for me, or do I have to break your mind into begging me for what I want to give you?"