Guys: What kind of flirting from a girl do you like the most?

It's kind of self explanatory...I have a ton of guy friends and I can carry a conversation and really do most of the things guys do with each other with my friends and I feel totally comfortable. But I don't act that much different with my boyfriend! He started out as my best friend, and we started liking each other...but now I feel like it's weird to act any different than usual and I don't know how to act! Any advice?:)
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