Mark stepped into the building, his mind reeling. This had not been a good day, and his frustrations were bubbling over. He had to do something. He looked up, having wandered through the mall aimlessly, his brain running in circles, to find himself in a veterinary’s office.

Mark sat down, with a sigh. What on earth was he doing here? He looked around at the pale, sterile walls, the posters of cute animals and the empty, depressing chairs, and made to leave. Wherever he needed to be, it wasn’t here.

“Can I help you, sir?” A pretty, Asian nurse grinned down at him. She was wearing a loose uniform and a cute little nurse’s hat. Mark found himself calming a little. But only a little.

“Uh, I need to be alone. I shouldn’t be here.”

The nurse immediately walked away, without a word, and Mark realised what was going on. His power, his…ability, it was working overtime. He was too angry and frustrated to keep a lid on it.

He got up to apologise.

“I’m sorry, stay if you want. I’ve…it’s been a bad week.”

The nurse smiled, returning to where she was standing before. So, she wanted to stay.

“I’m Tiara, nice to meet you. It’s been so quiet here, it’s good to have company. If you can call your miserable face company.”

Mark smiled, despite himself – Tiara had attitude, and she just about got away with talking to him like that. He’d take that over the shitstorm that was this week any day.

“So the vet business isn’t what it used to be?” Mark studied her face as he made small talk.

Tiara smiled, tucking a strand of long, dark hair behind her ear. “Everyone’s buying those stupid little toy-looking dogs, the ones overbred to shit. Well, they have all sorts of health issues, issues people pay a shit ton of money to have fixed, but the manager here doesn’t want to deal with them, so there goes about 50% of our business. I think it’s stupid, but what do I know – I’m only the assistant.”

“The price of integrity.” Mark smiled. He knew all about that. If he hadn’t told Xenia about that client contract, then…well. It was done, now. She was gone, along with his business. And he was alone.

“Come into my office.” Tiara smiled. “There’s no one here, I reckon I’ll close up for lunch. You want a drink?”

Mark smiled, taken aback by this kindness. They moved into Tiara’s office, a large, clean room with more animal posters and various shelves full of pharmaceuticals.

Tiara got out a bottle of whiskey and poured a glass. Mark raised an eyebrow.

“It’s 6pm somewhere.” Tiara smiled, grabbing another glass, filling it, and sliding it over to Mark. He took it and sipped at the liquid, wondering at what his day was turning into.

“So what does all this stuff do?” He mused, walking past the rows of glass cabinets, admiring all the drugs piled up in rows.

“Nothing much. Stops cats from dying, antibiotics for guinea pigs. Ear syringes. Pretty standard.”

“What about this?” Mark spotted a bottle of thick, purple liquid in a silver container. He could see the colour of the contents through the top of the cylinder, which was a plastic teat like a baby’s bottle.

“That’s to induce lactation in cows. We had to take it out to a farm – cow just gave birth, wasn’t producing enough milk. Some powerful shit. She was going crazy after that.”

Mark’s mind started to work.

“What would happen if someone drank it?”

Tiara laughed, looking at him with beautiful, dark eyes.

“Some serious shit, probably. It’s not meant for humans; it’s really powerful.”

“Do you want to drink it?” Mark asked. His dick was taking over now, frustrations flowing down through his body and engorging his cock. He shouldn’t do this. He felt his dick grow in his pants. He saw Tiara’s eyes flick down there for a second. She could see the bulge.

She looked away, her eyes unsure, even as her breathing rate increased. She was turned on.

“Drink it.”

Mark’s voice took on a soft, commanding tone. It was the tone he’d accidentally used earlier, the one that made her walk away. It was his gift. His curse. He could get people to do pretty much whatever he wanted. He hadn’t meant to use it here. But he’d had a hell of a week and really wanted to see what would happen.

Tiara frowned for a second, as the voice worked its magic, and then she smiled, stood up, unlocked the cabinet, and removed the metal canister.

“How much?” She smiled, pouring it out into the whiskey glass she’d just emptied.

This sealed it. He was in, now. And she was his.

“Half will do, for now.”

Tiara smiled, pouring the thick, viscous, purple liquid into the glass.

Mark smiled back. “Drink it.”

Tiara’s eyes flickered once more, and then she lifted the glass to her mouth, and began to drink. She slowly consumed about half a glass worth, when Mark told her to stop. She grinned, burping gently.

“Wow. This is going to be insane.”

Mark sat back, watching with interest as Tiara stood there, in front of him, her body starting to change. It happened slowly, at first. Just a tugging around the chest, as her loose nurse’s uniform started to warp. But before long, it became apparent – the very thing Mark was hoping for. Tiara’s breasts, formerly small and flat, began to slowly swell and grow. He could see it – he could actually see it – the small mounds that were tucked beneath the white uniform slowly pushing outwards, gradually swelling larger as the serum took effect. It was a powerfully arousing sight.

“Oh, you’re a cow, Tiara. Why didn’t you tell me you were a cow, with big, milky udders.” Mark smiled, leaning back in his chair.

Tiara smiled back, the power of his voice confusing her. “No…no I’m Tiara Lim, a nurse here. I…I work with animals, and I don’t have udders, I have…”

At this point she looked down at her formerly tiny breasts, which were now the size of tennis balls, bulging forwards, starting to tighten her uniform over her chest.

“Wait…I have breasts…why do I have breasts?”

“Not breasts.” Mark corrected, gently but firmly. “Udders. And they’re filling with milk. We’re going to have to milk you soon.”

“What are you…what are you talking about…ohhhhh.” Tiara groaned as her breasts swelled forwards, another inch being added to their considerably expanded bulk. Now they were starting to stretch the fabric of her tightening outfit. The buttons started to pull, ever so slightly.

“You’re getting so big, my cow. Filling with milk. What are we going to do about it?” Mark purred.

“No…no I’m not a cow, am I? I thought I was…aren’t I…”

“Look at how big your udders are – you’re the perfect cow.” Mark smiled, standing up, his huge erection leading the way as he stepped towards Tiara and her growing bust. Her boobs were already so much larger, at least D or E cups, and still growing. This was exactly what he needed.

“You’d best play with your cunt while your boobs grow.” Mark said, smiling as Tiara settled down in the chair, opened her legs, and moved her hand down to her pussy. Her breasts were now so large that they swelled into the side of her arm, and Mark loved to see them bulge against her.

“Use both hands.” He smiled, and Tiara obliged, sliding a finger inside her dripping cunt as she pulled her underwear off with her other hand, sliding it to the floor. With both hands by her crotch, her breasts were pushed together by her arms, and looked positively huge, swelling forth like melons. They were approaching the size of her head, and her uniform wasn’t going to hold much longer. Mark loved the thought of her engorging boobs bulging out of her clothes and bursting to the floor. He wanted her huge.

“Drink some more, then get on the floor and moo for me.” He commanded, and Tiara obeyed, more readily this time.

“That’s right. You’re mine.” He grinned, despite himself. This was the control he’d had taken away. It felt good to get it back.

Tiara waddled around the desk, her nurse’s clothes becoming more and more ill-fitting as her breasts expanded. Now her tits were so huge the entire uniform was riding up and exposing more of her toned legs. Soon he’d be able to see her cunt, her chest was getting so large.

She tottered round to the other side of her desk, and leaned forwards to pour the next shot. Her breasts lurched down to the table, and almost pressed into it. It was incredible seeing them swing and wobble. So much flesh. Her uniform was so tight now, so strained by her enormous, growing breasts, that it looked painted on. The buttons at the front were going to burst off soon. Mark looked forward to that.

She downed the next shot of liquid, and her body shuddered.

“What noise does a cow make?” Mark asked, powerfully.

“Hmm?” Tiara burped, giggling a little, her growing breasts shaking with mirth. Her buttons were straining tighter now, and little “o”s were visible between them as the fabric was pulled either side by her incredible chest.

“Get on the floor in front of me, cow.”

Tiara smiled, bouncing back around the desk, the new shot of serum already taking effect, her breasts groaning outwards like the massive sacks of flesh they were.

She got down on the floor in front of Mark, and almost fell on her face, her huge tits were so large, swollen and heavy.

“Ooof, I can barely move.” She grinned, hauling her colossal breasts under both arms, staring at them in amazement as she struggled to hold them up.

“Barely moo.” Mark corrected, and Tiara smiled up at him. She opened her cute mouth and let loose a moo, and her breasts increased another inch in size. They were now much larger than her head, and were starting to buckle her outfit. It was going to burst open, the thick patches of skin visible the in widening gaps in her uniform as her tits reached grotesque proportions.

“I’m so full! Mooooooo.” She gasped, and Mark smiled.

“Milk your huge udders for me.” He ordered, and Tiara started to massage her colossal breasts, which were growing bigger and bigger, fuller and heavier with every second that past. They were approaching twice the size of her head, and the more she stimulated them, the bigger they got.

“I’m going to burst.” She groaned, shuffling towards Mark along the floor, barely able to keep upright as her breasts heaved towards the ground. They were taking up most of her torso now, and were soon going to be resting on the cold floor.

“Ohhhh fuck….moooooo.” She groaned, taking her huge, distended nipples between a stretched thumb and forefinger in both hands, and squeezing down on them, hard. Her breasts pulsed and wobbled, filling up larger and larger, as if and they were water balloons and someone had plugged them into a tap on the wall. Except it wasn’t water. These were milk balloons, and if she didn’t empty them soon, they were going to burst open.

Tiara’s breasts shuddered and rocked, growing so large they were on the ground now, and her outfit burst open. Finally, Mark could see the scale of her bust, and grew even harder as he looked at how big she’d gotten. Her breasts were almost three times the size of her head, and took up most of her otherwise slender upper body. Enormous, shuddering, pale and veiny, they were absolutely stuffed with milk, shimmering and gargantuan in the office light.

Then they started to spray. Tiara mooed like her life depended on it, as her phenomenally large breasts began to lactate milk all over the room. Thick, arcing strands of milky white liquid blasted up and out of her preposterous udders, and shot around the room. She gasped all the while.

“Suck my dick.” Mark ordered and he unzipped his fly, and Tiara’s mooing mouth clamped over his rock hard dick, barely fitting over it as her increasingly large tits rendered her unable to move, even as they blasted milk all over the room. Mark looked down at his insanely inflated cowgirl, her tits soon to be most of her upper body, and before long was coming hard in her mouth, firing blasts of jizz deep into her throat and down into her belly. He couldn’t help it. He was too turned on. She was too huge.

Soon, he was done, and Tiara was on the floor. She was leaning on her breasts, which were the size of small beanbags. The lactation had reduced them, but not by much. They were colossal.

She looked up at him, expectantly, as if to say “What next?”

Mark was asking himself the very same question. He looked over at the cabinet of veterinary medicines. There were a few things he could think of…