This will happen regardless of whether you're single or not. You'll find yourself taking a little more pride in your appearance, you'll think of any excuse to go and talk to them and you'll make sure that you walk to the kitchen a few hundred times a day so that they can appreciate what you're wearing and how good your bum looks in those trousers. Whilst not many people like to get into a relationship with someone that they work with in case of a break up, harmless flirt is apparently recommended. If anything, you'll probably bring each other cake and have a good laugh together so even if you are married, it's nice to have a work spouse too.