My best friend likes to cuddle so we cuddled and then I found that she is placing my hand on her boob I didn't do anything but then she grabbed my hand and started doing motions for me so I went along with it.. Then she starts touching my boobs.. What will happen will things go back to normal?

Oh! Did I say boobies? Penises! I meant to say penises! Lots of long thick juicy penises!
I remember once in the dressing room for sports when we went swimming, we "found out" how different the consistency of breasts could be.
One classmate had very large(for her age) and incredibly soft breasts with small and soft nipples, and she was a starting point for what basically turned into a huge non-sexual groping session.
Soft and large, normal and firm, or small and sensitive like mine.
Quite a wonderland, alone the difference in nipples and their reaction was astounding.
So in OPs case, i could easily imagine that being a bit of the same curiosity turned sexual in a more intimate atmosphere... :)
Last summer, I had a party with gay girls, and super sexy guys, and when the party was over, 4 of my best friends, girls, stayed the night. Btw, they all r gay & love to cuddle! So we all told my parents we were going to bed, went upstairs, and pretended to sleep. So when my parents went to bed, the girls climbed into my bed and cuddled with me.
Next thing 2 girls were humping each other. And one of the 2 were touching my boobs, my ass, and my crotch, while the other was licking my crotch & my ass, and sucking my boobs, so I played along... They ended up RAPING me!!!!!! :(
Disgusting.
If you don't want to do something don't let someone else force you.
And seriously, don't kid yourself that things will just magically "go back to normal" if you just ignore it or keep on letting her touch herself with your hands.