Is it normal for a guy that your best friends with to just grab your boobs?

Ok so my best friend and I were siting in my teachers office alone because I was tudoring him and we were joking around and stuff and that he started playing the nervous game and when I said I was nervous he stopped like he normally would then ten minutes later he grabs my boobs and start playing with them and I kinda liked it is that weird
Is it normal for a guy that your best friends with to just grab your boobs?
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