Sarah couldn't help but let out a small snort of laughter at Molly's reaction, but she stood firm (sort of). "Uh-uh. No way. As your best friend, I have special privacy privileges, and if you can't keep it a secret, you don't get to know." SO THERE!
Except Molly would probably blab it anyway, and Sarah would be mad for all of two seconds before she got over it as per usual.