You don't know what Uncle Jack had done to you, but you know that he's more than magical enough to alter reality so that he's not your uncle and for some reason... you didn't want that?
Fuck, what has he done to you? You think to yourself as you're all alone, and drag your cock out from the layers of flab he had lovingly gifted you, horny at the thought of your nasty, gorgeous pig uncle. You masturbate as you come to the realization that whatever you put on can't change your love for him.
Knowing your uncle, he wouldn't be happy to have you waste your cum, so you stop just before orgasming, and step as quickly as you can manage in your fat body, looking for the perfect costume. When you find it, you can feel the air shift, as you notice a pair of overalls with a ratty shirt for the top. As you begin putting them on, you notice your uncle had included a flap for a portion of the fabric in the crotch area. You immediately need to masturbate... jerk your dick, but you decide to finish putting the rest of the outfit on first. As you finish pulling on the legs of the overalls, you notice your feet widening, growing hairier, and you begin to smell something emanating from your body. It quickly grows much stronger as you finish pulling on the ratty top that came with the costume, realizing that the outfit makes you sweat a lot more than you had even a few moments prior.
You button up the overalls finally, as you think about the memories flowing into your mind. Your belly fills your hands, your mind dulling further, only truly able to comprehend your size through feeling yourself as you grew eight inches taller and put on another 200 pounds of weight. Despite clearly being strong, all of your muscle is drowning in an immense sea of fat. The memories of your father passing at a young age, and your grandfather reading out the will, disgusted as he realized his two sons had a lifelong romantic bond, deepened to the point of demanding that you be entrusted to your uncle. You didn't understand why this was a "bad thing" at the time, later understanding exactly why it was the best thing that could happen, and to this day, you still don't understand why your grandfather is so disgusted at what's happened to you. You think about why he doesn't say anything, not realizing that your father and uncle had cursed him so that he will succumb to a worse fate if he does not continue with their terms.
The memories intensify everything you experience, quickly leading your erection to grow to full mast, which requires the unzipping of your crotch flap. As your dick unfurls, you discover that as you've become this redneck, your cock thickens to the point that it's far larger than a forty ounce. You're flooded with memories of your uncle helping you pump your penis, him helping you grow into the biggest, most submissive bear hick anyone in your county has ever seen. You're legendary among the town for having a dick so big fisting is preparation, and people can't resist your folds despite what they think of your relationship with Uncle Jack.
You collapse to the floor, barely able to pleasure your enormous dick due to its outrageous size, as Uncle Jack walks in. Out of the corner of your eye, you see him stumble as the memories of your new life together flow into him.