Since Hat Trick houses a ridiculous amount of rescue rabbits, he knows when some become too old to adopt (and when they might be too old to want to deal with younger bunny shenanigans). When they reach a certain age, Trick takes them to Fluttershy’s Animal Sanctuary, where he knows they’ll be cared for in a nurturing, yet natural, environment. Fluttershy is always happy to take in more bunnies and the two usually chat for hours about their similarities while cuddling rabbits. Hat Trick absolutely adores her and even if he can’t visit as much as he’d like, he always sends fresh veggies to the sanctuary whenever he can.  
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God Fluttershy looks so much better in my improved style, last time I drew her was like 3 years ago? Wack