The zookeeper snuck into a nearby yard containing a family sitting around a table having dinner. The family was comprised of two parents and their three sons.
"This will be perfect!" The woman quietly chuckled as she wandered towards the family's nearby sprinkler tap and inserted all of her remaining spray into the connecting hose.
The family was jarred from their meals by water spraying from the nearby sprinkler. Cries to turn the sprinkler off rose from the table, as one of the boys jumped up and ran to the sprinkler tap.
As he turned back towards the table, however, the family got a view of an enormous erection tenting the boy's jeans. The boy looked down and blushed as the erection swelled further and fully tented his pants.
"Matt, um, do you need some alone time?" the mother asked as she regarded her son. A similar suggestion came from the father before he was cut off.
Matt suddenly groaned loudly and ejaculated into his tenting jeans. Given the size of his erection, Matt's seed was spurted throughout the surrounding yard to settle among the sprinkler water droplets.
Silence settled on the yard, with the only sound being Matt's deep, post-orgasmic breathing. The surrounding family members were taken aback by the unnatural behavior displayed by their son and brother. The silence was eventually broken.
"Oh my god Jim! It's happening to you as well. And you Rick"
The father, Jim, got up from the table, a blush also on his face. He began assuring his wife and sons that everything was fine before he was cut off. The enormous bulge filling his pants said otherwise. A long groan emanated from Jim's throat as he himself ejaculated over the family's table and lunches. Beside him, his son Rick, experiencing his own erection, came all over the underside of the table. The remaining mother and son could only watch as the three males continued their changes.
Jim and Rick pulled away from the table and joined Matt. All three family members began thrusting heavily against their jeans, prompting additional orgasms and ejaculations. Before long, the pants of all three were drenched in seed. The throbbing erections tenting their jeans, however, eventually began to decline in size as the three zoo victims continued orgasming and spurting out cum. Eventually, with one last loud orgasm each male's penis and balls pulled up into their bodies, leaving them with vaginas. The three looked in horror at each other and the watching family members as some clarity returned to their minds. This clarity was short lived.
These changes continued as breasts grew out on the chest of each victim. Shirts were torn open as the breasts expanded in size. Milk from the growing mounds eventually began spraying, drenching each of the father and sons. Remaining clothing shredded, as human bodies became beastly in appearance. Tails erupted from the backsides of changing family members. Hands and feet became hooves and fur enveloped bodies.
An udder formed in Jim's crotch area as the changes neared completion. His wife gasped in horror as a long moo emerged from his extending mouth. Jim's transformation finished as milk began dripping from his new udder. Matt and Rick, meanwhile, had fully changed into a pair of jennies. Both donkeys were desperate for sex. The remaining mother and son watched in shock as their former family members ran into a neighboring yard. The jennies were set upon by two jackasses that threw themselves on the backsides of the former brothers. Jim was ambushed by Melanie as she mounted him and thrust relentlessly into his new folds.
The mother and son were not to escape the changes though. Their changes were only slowed, having been seated further away from the sprinkler.
"Oh my god mom! They changed into animals. What are we going to do? What if we're next? We need to get help." The remaining son, Edwin, pulled at his mother, trying to provoke some form of response.
Edwin's mother got up from the table facing away from him. His gaze fell on her firm ass filling out her jeans, thus driving his own change. A large tent began developing unnoticed in his jeans. Edwin's mother then turned around and his jaw dropped.
On the other side of that firm ass, was a full bulge tenting out Edwin's mother's jeans. She was looking down in shock at the bulge, unable to comprehend what was happening to her. The two looked up at each other, fear in their eyes. The silence was broken by a groan from Edwin.
Similarly to his father and brothers, Edwin's penis, now fully erect, began spurting cum through his jeans. The torrent continued, soaking the surrounding chairs and tabletop. He pushed back against the change and was able to gain some foothold before being distracted by a sound next to him.
A loud groan escaped Edwin's mother as she suddenly leaned against the table. Her erect penis was now at a breaking point in her jeans and obviously providing some serious discomfort. She looked up at Edwin again, fear in her eyes, before her mouth opened and she came spectacularly over everything. Waves of cum swept on and over the table as Edwin's mother bucked her hips uncontrollably. The look of fear turned to one of manic lust, as she thrust her growing member against the table.
Edwin now horny, focused on his mother's ass. Unable to control himself, he pushed himself up against it, expelling cum through his and his mother's jeans as he grinded against her. As his grinding and orgasms continued, breasts broke through Edwin's shirt and milk sprayed all over his mother. As female hormones flooded into Edwin's mind, he grabbed at his mother's new equipment through her jeans. He began stroking it and accelerating her own changes. Before long, the two were ejaculating in turn as Edwin jerked off his new masculine mother. Edwin's hand dropped away and his thrusting deteriorated as his equipment pulled up into him.
As the grinding ceased, Edwin's mother turned around. The belt and zipper that had been holding her new penis and balls in had been shredded, exposing her massive erection and lust. As Edwin's mother eyed him, she became more ape-like and masculine in appearance. A long groan escaped the former woman, as Edwin's mother ejaculated from her massive tool and milk began spurting from her feminine breasts. The breasts decreased in size and, before long, Edwin was looking at a male ape wearing his mother's clothes.
Edwin's now male mother grabbed her new feminine son and slammed her erect penis into his new pussy. She humped him vigorously until eventually she unloaded her balls. Both mother and son detached from each other, the only remnants of their former lives being the clothes hanging off their changed bodies.
"Bravo! Now I have some new attractions for my show." The woman clapped as she instructed her zoo staff to load up her new prizes.