I feel like flirting that leaves the girl room to choose to continue on in the conversation without addressing the flirting is subtle enough. For instance:
"Hey baby, you're like my big toe, because I'm going to bang you on every piece of furniture I own" kind of leaves her to make a split-second decision on whether she wants to shoot you down or reciprocate. Meanwhile, subtly teasing could be part of a normal conversation.
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