As you finally came that you fill the insides of the costume tail with your semen. as soon as it came in contact with the suit However, it absorbed it. it was beginning to activating itself as it began to fuse with your body.
You feel so pleased with yourself that you cannot do anything but lay down and watch. The tail combined to your legs while turning you into a humanoid fish, a Merman. your body started to bulk up in muscle, and the tiny scales pierced your skin and became your own scales from the waist down.
flopping your tail around as the though of your girlfriend seeing you like this that you were getting horny as it was happening. You can tell as your new tail was strong and powerful as it was impressive. there was something However about the costume you didn't considered, how were you going to hide your new tail from her? and now that your a merman, are you planing to leave her for the life in the sea? you know one thing for sure, this tail was...