What do you do with your tongue while kissing?

Anonymous
I recently got my first kiss. I don't get what I'm doing when the guy starts using his tongue. Like do I open my mouth wide so that my top lip is touching his top lip and my bottom lip is touching his bottom lip. And then when he starts sticking his tongue out kind of thing I open my mouth a little wider and let him put his tongue inside my mouth? And then I take my tongue and put it inside his mouth? But then what the heck do I do with my tongue?

1) Circle my tongue around his tongue
2) Caress the sides of inside his mouth

I'm lost, help?
What do you do with your tongue while kissing?
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