You can't explain it, but even though the drink didn't taste that good, you find yourself wanting another. The guy rolls his eyes and pours another putting it in front of you. It seems to take him longer to mix, but perhaps that's just the fact that you want the second drink so much. He finally slides it over to you and you grab the glass with both hands and tilt it back, finishing it even faster then you did before. You sigh and relax as you place the empty glass on the counter. Even though the taste hasn't changed, the drink seemed satisfying.
You grab a few pieces of popcorn from a wooden bowl on the bar and nosh on them. Small pieces of it get stuck in your teeth and as you use your tongue to try and dig them out you notice your canines seem a bit longer and slightly more pointed then before. You don't have time to worry too much about this as you feel a lump starting to grow from your tailbone. You move your hand to your rear as casually as you can to find out what's going on. You first thing you may have sat on something in the chair, but it's empty, and as you lift yourself slightly off the seat, you find whatever it is comes with you...and it's growing.
"Whafht...What's in this?" you ask. For some reason your tongue is oddly different, and you can feel your teeth lengthening. Your ears, now also feel strange. A combination of an itch and pins and needles cover your ears, they also feel a bit hot. You feel them and are startled to feel that hairs are rapidly growing on them and their shape is changing. The bulge in your tailbone changing. It's not growing in diameter, but it is getting longer. You can feel a tail growing down past the leg of your underwear and down your leg. Your pants get quiet uncomfortable.
"Want another?" the bartender asks. You're no fool. You're aware that these changes began after you started drinking that stuff. You don't want them to continue, or at least you're pretty sure you don't. When he offers to make you another, though, you find yourself agreeing immediately, wanting another even more. Your mind is occupied by the tail still trapped in your pants, and the fact that it's wagging involuntarily. While you occupy yourself with controlling it the drink arrives.