Staring in fear at the latex you use your arms and try to hold onto the sides of the tub, your massive belly getting in the way as you tried to pull yourself out, but a sudden twinge in your lower body, and the feeling of attachment from the latex stopped you.
Looking past your belly you felt the latex in the tub attach itself to your torso, the latex attaching to your body as you shivered, feeling the latex as if it was part of you. But it didn't stop as you felt all the latex in the tub shift and take shape. A long tail forming in place of your legs, made out of the brown latex. At the end of the tail a large fin grew as the latex started to change color, becoming a lovely green as a scale pattern formed along it.
The tail was still made out of latex, but you could feel it, and most likely control it as you tried to move the tail, watching as it flipped up to be in front of your vision, just past your belly. You now had a mermaid tail made of latex in place of your legs.