Heh, never expected to see this challenge get done again after AnimeLover's FF crossover story from a ways back. Pretty good story overall, though I would say it could have maybe had a bit more buildup in the beginning, like Tifa having to shoo off some lingering barflies, maybe even with a few trying to flirt with her and get her attention while she's just focused on closing up and hitting the bathroom asap. Also, a few spellling errors, but nothing too serious;

Missing "her" when first mentioning her bladder and bowels. So she might as WELL go. Also, slided isn't a word, just slid. A few other words could probably be rephrased to make their tensing fit better. Other than that, this was a good, short read.