When a guy and a girl can tease each other back and forth for a long time, what does it usually mean?

Anonymous
So there's this girl I know, we are not "officially" friends, but we talk a lot. Every time we talk, its the most fun I have with anybody. We tease each other and throw sarcasm at each other, but we have all these great lines and comebacks, its almost as if it was scripted, but it isn't (weird huh) like anything we say at each other, we turn it around and make fun of it or twist in in seconds and we keep going back and forth. We argue playfully all the time and people who hear us always crack up because its funny, but neither of us really laughs, its very deadpan (we both know we are kidding) but it looks serious lol. I know I like her and that's why I'm "on" all the time when I talk to her, could she feel the same?
When a guy and a girl can tease each other back and forth for a long time, what does it usually mean?
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