Twilight Sparkle's Dirty Secret

After a month's wait, Celestia's book is finally returned from Twilight. But when she discovers something on it that shouldn't be there, Twilight's dirty secret is revealed.

After a month's wait, Celestia's book is finally returned from Twilight. Yet there's something off about it... And further investigation leads to a very dirty fact. Something that should've been left untouched.

Twilight Sparkle's dirty secret.