Immediately a new thought comes to mind, a much dirtier thought. You start fantasizing about all the furry porn you watch all the time, and if he's a werewolf, like an actual one with a real, contagious curse, maybe you can live out that fantasy. You hear Jack's stomach growl loudly, you gotta make sure he's happy first.
You rush over to the fridge and swing it open so Jack can fill his fat belly with as much food as he can eat. Sloppily throwing all sorts of crumbs, containers and condiments everywhere, soon he's almost emptied the fridge out, pulling his dirty snout out, both with a look of content and just covered in food. You call Jack over, his big, fat form, still towering over your head. You grab one of his long clawed fingers and run it down your forearm, infecting yourself with his curse.
You rub your hand down his sheath repeatedly, watching him get more and more excited as you do, as his bright red penis slowly begins unsheathing, already leaking in warm precum. You grab it with both hands and begin sucking on his wolf cock, hearing him howl in pleasure as you do and even louder as he unloads his canine seed into your mouth.
At this point you haven't quite taken form just yet, white fur covers your body and claws grow from your fingers, but you still just look like a hairy human. You hear is bowels churn from all that food from earlier, and you have an idea, one that your human mind would've rejected, but as you become more and more wild, it gets you excited. You reach under the base of Jacks tail, feeling his asshole with your clawed finger, he moans loudly, clearly aroused. You whisper in his ear, "let me eat it." His tail starts waging as he presses his furry ass against your hairy face. You press your lips against his ass hole feeling it start to strain and open, letting loose a big greasy turd right into your mouth. You chomp on the scat with your new sharp teeth, savoring the meaty, rank, flavor of the shit. It tastes awful but you find yourself aroused having eaten your new lovers scat, finding your unable to resist licking his asshole clean, feeling it clench, and listening to his soft grunts with each one.
At this point you're no longer human, just a werewolf like Jack. Fully transformed, right about his same height, thick white fur, claws, thick red cock, everything and the two of you are ready for a night of passionate canine love to kick off the rest of your lives.