Keyword #1: Chicks
Rabbits aren't the only animals associated with Easter. Baby chicks are also a featured animal. Bunny started the tradition in his prime years after he accidentally harvested some eggs with chicks in them and, as he laid on the eggs, they hatched. To this day Bunny keeps up the tradition of including chicks into the holiday of Easter. In between his egg deliveries Bunny would deliver newly hatched baby chicks to those in need of a chicken/rooster, or just looking for a pet of the clucking kind. And one of his deliveries included a special baby chick for a special someone in his life. Bunnymund poked his head out of his magic hole to make sure that a certain snow spirit didn't see him. Then he placed the basket with his special delivery out and left. Jack Frost arrived at his lake soon after, and was greeted by the sound of sweet chirping. He looked down and in a green basket was a little griffin baby. And attacked to the basket was a note that read;
"Found the little tyke alone. Figured you would like a little flying friend when you soar about. See you after Easter, Bunny~"
Keyword #2: Eggs
Bunnymund's little googies were the center piece of Easter. Their bright colors, festive colors made all the Lights and the Lights at heart smile as they held them in their hands. Some humans even craft their own colored eggs. They may not be as perfect as Bunny's but they're pretty good. And for this year Sophie and Jamie made their own special Easter eggs. They were depicted after Jack and Bunny. At first the two Guardians started out flattered, but that changed for Bunny when their two favorite kids made the painted images on the eggs kiss. Jack only laughed and said that this was the day that E. Aster Bunnymund had a face as bright red as Christmas. After that Bunny started whistling around for Abbey to eat him alive and spare him the embarrassment.
Keyword #3: Basket
Baskets are essential for Bunny. They carry his eggs, the candies and work as perfect make-shift beds for the eggs he kept with him. And while he never admitted it, he actually had a thing for pretty baskets. So when Jack found out quite literally through a gossipy grapevine he surprised his Pooka lover with a handmade basket with all sorts of shades of blue and green. Soon after Bunny got his surprise basket Jack received a surprise kiss.
Keyword #4: New Clothes
Another thing about Easter was that it was a time to buy new clothes to go along with the new beginnings. Namely the new beginning of fashion trends, but it was still a tradition of Easter and so Bunny was duty bound to see it through. Which was why he commissioned a new outfit for Jack, having them made in a mix of modern and traditional Pooka styles. Jack was very grateful and all too happy to wear his new outfit. Bunnymund was very glad to see that his lover liked his new clothes. And he liked it more when they were alone and he got to see Jack take them off.
Keyword #5: Spring
Spring is the main theme for Easter, as the bright and beautiful colors of the flowers, grass and sky inspire the colors of Bunnymund's eggs. So he wasted no time in spreading all sorts of lush spring color around the world. But he saved his best burst of spring for Frost Lake. Bunny covered the earth of Jack's home with the greenest of grass, turned his trees the richest of brown and gave him the most colorful of flowers. And to show his appreciation Jack gave a light, cool breeze to make the flowers sway and sing their little song.
Keyword #6: Rabbit
Despite his looks and name to the contrary, Bunnymund isn't actually a rabbit. Nor is he a hare. He's more or less an alien with a rabbit like appearance. But for the sake of avoiding confusion he plays along with the rabbit persona people have placed on him. Its much easier to say than "other worldly creature of unknown origin", after all. The fact that he acts like a rabbit could probably explain his bursts of rabbit like behavior. Either he would find himself craving carrots, meticulously cleaning his fur, cowering in fear at any canine he saw or thumping his foot for reasons besides making his magic holes. One reason he'd often thump his foot, so hard that he would nearly break it, is when Jack would hum a song and play with his ear or nuzzle his nose with his in an Eskimo kiss.
At this, Pitch would just shake his head and say "Twitterpated".