Finger sucking? Why?

goddess_
So these 2 new guys moved to my school and one of then flirts with me a lot. The other day I got in a argument with some girl and I was mad after and he was like "here suck my finger so you can calm down." And I was just like wtf but I did it anyway. And today he was pointing at my face and for some reason if you try touching my face I will lick you. so he told me to do it again so I did again. Then after school he just shoved his finger in my mouth. Why does he do that? Like it doesn't bother me at all but why? Lol
Finger sucking? Why?
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