Nightmare Moon has always been known for causing fear in ponies, and her main goal has always been to bring eternal night to Equestria. But after she was redeemed by Twilight, she turned out to be somepony very loving, but mostly with the pony that helped in her redemption.
And with today being Hearts and Hooves Day, Nightmare Moon spends the holiday afternoon together with Twilight, and she intends to demonstrate how much she loves the unicorn while she has Twilight in her hooves.
Cuddles