The party goes smoothly with everyone enjoying the Hogbrew and eventually all the party guests are already holding their third can of the porcine beer. Unbeknownst to you though, was that the beer wasn't the same that Trevor and Butch have been sharing with your family. Knowing it would be a special occasion with a good amount of people, Butch had prepared their stash of Hogbrew Reserve; a much more potent version of the original Hogbrew and its effects were showing quickly.
For pig men like Butch and Trevor, the Reserve was just a better tasting beer to them. It was clear that normal humans were much more susceptible to its contents as even some of the stronger guests were already slurring a bit in their socializing. It was only the second can and you and Kate both clearly had dopey smiles on you faces as your eyes lock in with each others.
Soon there was a knock on the door, signalling Butch, the only one not affected by the beer, to open the door with a smile, already knowing who was on the other side. There stood Trevor with extra cases of Hogbrew Reserve squishing against his soft belly. Behind him was mum, Grace, Lucy, and even Zoe, all with slightly inebriated looks on their faces.
"Haha! Looks like you got the whole family back together again Trevor!" Butch laughed, giving his buddy a friendly slap on the back as he walked in with the extra beer. "Heh, it was pretty easy, really. Of course, their mother was already eager to go and convinced the other two no problem." Trevor explained as Whitney, Grace and Lucy walked right in, eager to open another can of Hogbrew. "This one needed a little convincing though!" He says, pulling Zoe into his sweaty arm as she giggled at his closeness.
"After a few minutes of volleys of insults, I finally got her to relax with my signature hypnosis 'therapy'" Trevor explains with a wink as Zoe grabs and opens another can of the Reserve. "Aw Mr. Trevor, you were so nice to do that for me!" She says with a sway before downing the can whole. As the liquid emptied into her mouth rather quickly, it was clear her stomach began to bulge out a little more.
"Oh, I can tell this will be a party they'll never regret..." Butch says with a chuckle and a snort, opening his own can of Hogbrew Reserve.
---
Just after everyone's sixth can of beer, the party was going hog wild, so to speak. Nearly everyone's stomachs bulged out enough to peak from their shirts and pants with some of the more muscular guests growing in muscle mass as well like Butch. The effects of the Hogbrew Reserve had now kicked in, which was appropriately named 'Hog Wild' on a label on the cans.
Whatever decency was brought to the party was now all but gone as food was being eaten messily left and right, Hogbrew cans littered the floor and furniture, and clothes strewn all about. Whitney was already on the her hands and knees on the coffee table as Trevor was plowing her from behind, with familiar sounding smacks and snorts emanating from the two. It was quite a show for some of the other guests who were so drunk that it wasn't at all shameful or disgusting, even as a curly tail pushed out over mum's rear as she happily squealed for her porcine lover.
Other guests were having their own 'fun' as well, including one round student getting a blowjob by his best friend while sitting his pump butt on the toilet, some of the now pudgy from class were making out as their noses pushed out and squished against each other like pig snouts, and even Stacy was being 'trained' by Butch on how to correctly take his pig cock up the ass correctly.
All the while, you and Kate have been sprawled naked on the floor as you two kissed each other without resistance, squishing your now swollen bodies together. Although, it seemed that hanging out with Butch for a little while allowed you to grow some muscle as well. What was even more surprising was that Erika was perfectly fine with what went out of hand... as she was spooning her own pudgy body against yours from behind. The alcohol and whatever else was in the Hogbrew made the situation perfectly normal in your mind as you enjoy being sandwiched by your girlfriend and her sister.
Clearly, the night truly did go 'Hog Wild' but it was about to get even crazier...