Question: how to flirt with a guy over email?
Answer: Start off slow. Part of the excitement of any flirtation is the hint of uncertainty that comes with it. ... 
Leave them hanging. ... 
Be mysterious. ... 
But let him know he's been noticed. ... 
Keep it light. ... 
Remember: This isn't a date (not yet) ... 
Use innuendo, within reason. ... 
Be careful that suggestions don't turn into promises.