Erika felt a warmth pass through her body, down to her butt...and all of the sudden she had to let out an embarassingly long wet fart. Erika felt down her panties for a moment and felt a moist spot, she had actually sprayed all over them. But the worst thing was, an odor now penetrated the room which she had never smelled before, a stench so foul it made her dizzy. "Damn, I've never stunk that hard...could it be the stuff from the bottle that caused it?", she thought. In the meantime, fine black hairs had started appearing above her butt that were quickly expanding and creating a bulge in the backside of her pants. The bulge continued to grow, the pain increasing as it did until finally the fabric tore in the center and a giant fluff tail released itself. Erika grabbed the tail in astonishment, the surface feeling curiously silky, completely covered in black fur with large white stripes across it. She twitched her new tailbone, and the huge tail moved back and forth at her command. "So this is what caused the smell", she thought, "let's see if I can do it again." She bent over, gave a few good flicks of her tail and problemlessly fired a spray of stench chemicals from her tail glands. She had a huge tail now, but what would she do with it?