A longer tail sounds nice, so you start another dipping session. While you're sitting by the side of the pool, you poke your pot belly. You wonder if you're capable of getting hungry. Probably not, if you don't even need to breathe.
You notice your lower arms are still thicker than your upper arms. You grab a clump of chocolate out of your stomach and spread it out across your upper left arm. You do the same to your upper right arm. Now things are more evened out. You continue to pull the extra chocolaty flesh from your "pregnant" belly and toss the chunks into the pool. Once most of it is disposed of, you smooth out your stomach. It's almost back to the way it was before you came to this house, though you've left it a little chubbier just to fit in with the rest of your body.
You stand up again, pulling your tail out of the pool and inspecting it. It's much longer now, and very thick. Too thick, you think to yourself. You spend another few minutes kneading it thinner, pushing the chocolate and elongating the tail even more. Once it's thinned down to be about arm thickness, you leave it be. It's so long that even when you stand up there is still two feet of it on the floor. It's very prehensile, like a monkey's tail without the fur.
You continue to play with it. You try to arc it all the way up to your head, and you try to hone your abilities by getting it to touch the tips of your horns. You miss several times, but each attempt is closer than the last.
You're so focused on this exercise that you don't notice the pool's surface rippling behind you until it starts to make sloshing noises. You turn around, startled, and your eyes widen at what you see coming from it...