Sentence:  'Oooh, don't.' Lilly staggered behind the counter. 'Hangover from hell. We had a good time, I think. He's such a <WSD>flirt</WSD> though. He really fancied Midnight. Was sooo gutted that she was actually a straight man. Think it almost turned him celibate.' 
Meaning of the word marked with <WSD> tags:  Someone who flirts a lot or enjoys flirting; a flirtatious person.