Why did he bite my ear?

i went to a party last night, with my best friends, one of them has already stolen a kiss from me twice... and last night he didn't try to kiss me or anything, he just sang to me right into my ear, then hugged me pretty tight and bit my ear, he didn't stop for like 15 seconds idk, like... why? he's one of my best friends
Why did he bite my ear?
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