Heartwarming / Evil Belle

• All of Rarity's interactions with Evil Belle are either this, hilarious, or both. Especially after her sister's clone army vanishes and Rarity tries her best to comfort Sweetie, who is worried that she'll never live up to her evil claims. Tucking her in at the end of Evil Belle’s return is icing on the cake.
• Celestia -and later Luna- playing along with Sweetie's "evil scheme" in Evil Belle takes over Canterlot, all before having milkshakes.