"Never mind that." Jack chuckled, picking up the wine bottle. It was still less than a quarter down, and as the store owner had promised, very little had been needed to turn Pat into the border collie girl she was now. He examined it in the fading daylight coming from outside the barn, and grinned deviously.
"You got that look." Pat put her hands on her hips, tail wagging. "I know that look. You're up to no good."
"I am, that." Jack admitted, and grinned. "What d'ya think would happen if we gave you a little more? You know, just to see what'd happen."
"Dunno." Pat shrugged. "Guess we'll have'ta find out, huh?"
The border collie woman drew close to her master and deftly grabbed the bottle out of his hand, sloshing it a bit, bumping her tits against his arm. "Oops, how clumsy of me." She winked.
"Hey, not much now!" Jack warned.
"All right. Just a little sip. And if it does what it did to me before, you best be ready to lay me again." She chuckled, and upended the bottle in her lips, taking a little swig.
"Yes ma'am." Jack nodded, and took the bottle back from her hand.
"Feels plenty strong this time." Pat gasped sharply, arched her back, and let out an aroused sigh. She squeezed her legs together as she grew larger... sleeker. Taller. More curvaceous. Her tits grew even bigger under her fur, which was getting longer and softer. She didn't become any more humanized, she kept her same anthro form, but she had sprouted up a full foot taller, making her a little over seven feet, and she had soaked in a bit of muscle in the process, not to mention more tits and ass.
"Whoa." Jack gaped, feeling his boner rising. "You got... big."
"Hmm!" Pat smacked her own ass, admiring the firmness, and played with her bigger and more voluptuous tits. "Seems I did, that." She stood in front of her Master and marveled as she now towered over him by much.
"You look so huge." Jack gasped softly, awestruck.
"You look so little." Pat said sweetly, with the same amazement.
"A-Are you horny again?" Jack said gently, not wanting to offend her, suddenly quite conscious of how small he was.
"Are you?" The canine grinned, tail wagging again. Her hands rested on his shoulders, dwarfing them somewhat, and she grinned. "Think you can satisfy me like this?"
"Ma'am..." Jack gulped. "I'll die trying."
As it began to get dark, Pat lay down on the hay pile again, her huge defined and busty black and white fur a stark contrast to the golden hay. A full foot taller than a human being, built like a solid woman, her animal body projecting lust as she spread her legs wide and made a show of touching her dripping pussy.
"Damn." Jack gulped again. "I don't know if I I'm big enough now."
"Well, let's find out, little man." Pat said with a growl. "Come fuck me."
Jack approached the dog woman and took off his pants, boner hard. This time, he entered her gently, and was amazed that she was still comfortably tight on him, though bigger. It took a little getting used to her larger size, but he found she encompassed his cock just the same despite her larger size. She laid back and let him fuck her, both of them growing passionate and more desperate as their aching bodies began to grind harder and faster once more.
It was Pat who came now, her large voluptuous body heaving and panting from nearly an hour of building intensity. When Jack at last released from his painfully hard cock, it was a massive release, exhausting him of everything he had left. Panting, aching, the two of them relaxed in each other's arms lovingly, human held close to a big furry chest, and they both stared up at the roof with smiles.
"Ya know..." Pat grinned. "Kinda like being this much bigger than you." The dog laughed a bit.
"Oh?" Jack said groggily, quickly falling asleep.
"Yeah. Lets me protect you better."
"Aww." Jack said with a smile, and drifted off into a cum coma.
"I wonder what we'll do tomorrow." Pat chuckled, and fell asleep next to Master.