The screen shows a view of your mother and sister around the kitchen counter.
Having just seen the changes to your father, you silently urge your mother and sister to flee the house and the zoo's nefarious plans. Your plans are dashed as you listen to the ongoing conversation.
"We need to stay and make a plan honey" you hear your mother say.
"But we can't just leave him with the zoo. We need to call the authorities or go ourselves if need be" pushed your sister.
Your mother sighed in response. "I don't think you know what we're dealing with hun. There's more at risk here than just your brother. I don't want to go into the specifics just yet, but lets just focus on the plan for now".
A distant whinny disrupts your mother and sister's discussion. "Did you hear that mom, it sounded like a horse?"
"Oh it was probably nothing" your mother said as she shrugged off the sound.
"Bad move", you hear from the woman beside you. "That stallion cum from daddy is a bit more potent than the stuff we sprayed in your garden."
Your mother and sister continue their discussion. It took a minute or so before you noticed a change. Similarly to your father, a faint blush was appearing on your mother's cheeks as she began sniffing slightly at a scent in the air. Her nipples began poking out slightly as she began breathing more deeply. Your mother began squeezing her legs together as a slight warmth developed in her nether regions.
"Hey honey, does it seem hot in here to you"?
"Not really, you feeling okay mom?"
"Of course hun, I guess it's just the recent events catching up to me".
The kitchen discussion returns to normal as you continue to watch the screen. At this stage, you begin to notice a new frightening change. Between her crossed legs, a slight tent is developing in your mother's cowgirl jeans. You watch in horror as the tent grows in size, stopping just enough to be visible, but not be noticed by your mother. Your mother, meanwhile, has been able to regain some of her composure, despite still feeling the effects of the intoxicating scent.
It was then that you noticed a visitor in the feed. Your father's stallion form filled the clear kitchen door catching the attention of the kitchen's two inhabitants.
"Is that a horse", your sister exclaimed.
"A what"? Your mother turned towards the door and the stallion. In her aroused state, your mother's gaze immediately drifted to the now erect penis extending from your father's crotch. Your mother's changes then began progressing in earnest.
A sequence of loud popping sounds reverberated through the kitchen. Your mother's face turned red as she felt two familiar objects fill the confines of her jeans and undergarments.
"Mom, are you okay? What happened?"
"Nothing honey, I'm fine, really!", your mother lied. "It's just old age, nothing to worry about. Let's maybe go... OH GOD!"
Your mother's eyes went wide as a long, low groan escaped her throat. She backs away from the kitchen counter giving you a clear view of her jeans. The jeans had a large wet spot on the front, evidence of the recent ejaculation from her new penis and balls. The tent in your mother's pants begins to grow faster now. Before long, similar to your father, your mother's new penis was at full mast in her tight cowgirl jeans.
"Oh my god, mom!", your sister exclaims.
Your mother, however, is speechless. A second low groan escapes her mouth, as her eyes go wide and she ejaculates a second time into her jeans, cum now dripping onto the floor. Then the bucking began to start.
Your mother knew she shouldn't, knew she was only encouraging the change, but couldn't resist. She began bucking her hips in a slow rhythm at first, but one that began speeding up in intensity. Your sister could only watch horrified as her mother, now humping steadily ejaculated through her jeans again, then again, and then again. A mess began to form around your mother as her changes continued.
Your mother now desperately needed something to relieve her building heat. She looked around the kitchen in a frenzy, eventually settling on a large chair beside the kitchen counter. Your mother thrust her bulging crotch towards the large hole at the bottom of the chair as she began humping it as a stallion would a beautiful mare. Your sister gasps in horror as black fur spreads across your mother's exposed body. A lump forms in the back of her jeans as your mother's tail begins to grow in, constrained by the belt wrapped tightly around her waist.
You watch in surprise as milk suddenly shoots from your mother's breasts as her chest barrels out. As the milk gushes out in diminishing intensity, your mother's breasts dwindle in size, eventually receding into her chest. This is followed by the buttons on your mother's soaked shirt exploding off as her chest grows in size.
Your sister and you now watch as your bare-chested mother continues to hump madly against the chair. While she has ejaculated numerous times by now, your mother was not prepared for the one that was to come. The pressure from the jeans and tight belt on her new penis was becoming too much to bear. With a loud "OH MY GOD!" your mother roars, startling your sister and you, as her penis and testicles jumps in size. Your mother's belt is snapped open and the front of her jeans torn apart as her monster springs forth and cums everywhere. Your mother's penis continues to extend out, growing to a length fitting that of a great stallion and her balls continue to produce lust fuelling testosterone. Your mother now completely under the control of her changes renews her assault on the chair with new intensity.
Your sister, hands over her mouth, continues to watch as cracks and pops are emitted from her formerly sweet mother's body. Your mother's tail, now unconstrained, springs free from its confines. Your mother's hair grows into a mane, covering her changing face. Your sister gasps in shock again as she sees a muzzle emerging from the mane, followed by your mother's now equine face. Hands turn into hooves as your mother nears the end of her change.
With one last massive sequence of thrusts into the chair, a loud sound resembling a moan or whinny breaks free of your mother, as her new stallion balls empty and she cums spectacularly into the chair and surrounding kitchen. Your sister sees some clarity return to your mother's now equine eyes, as the new stallion pulls free of the chair, dripping cum across the kitchen.
"Need to get... get help" your mother stammers as she struggles to form human words. Your sister can only nod in shock.
Your mother begins walking towards where your sister had retreated, limp penis dangling below her legs, anxious to get help. You note in alarm, however, that as your mother moves towards your sister, her penis begins slowly hardening and extending out. Your mother does not recognize the growing lust fuelled by her testosterone producing testicles, only knowing the potential rescue your sister offers.
"Well this will be interesting" you hear the woman chuckle.