What are some semi flirty birthday messages?

This guy is my friend and we like each other as friends but there’s an undeniable spark for sure. He usually flirts a bit but I’m always shy to do it back. I figured I’d send him a nice birthday message but with a tad bit of flirty vibes. Just to see his reaction. Maybe even a meme or something lol. He’s out of town so we can’t meet so texting will have to do. Thanks!
What are some semi flirty birthday messages?
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