Hum

I just don't get it, why always hurt that came out?I didn't mean it at all, it just a joke right? That she tickle me, so I tickle her back..But it seems that somehow I hurt her....This made me wondering...Is it that hurt? That she mad at me?Lately I always accidentally hurt her, but that was accident..She also hurt me..But I never take it personally, this way...I swear I won't tickle her again.