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Sky didn't like to say it, but it was kinda weird that his brothers didn't have wings.
He wasn't being mean! Just. You know. He came from a world where wings were the norm. He couldn't imagine living without them at his back, without the thrill of flight, without the sky beckoning to him.
He was also fairly certain his brothers were kind of jealous. Which: duh. He had wings. That was objectively cool.
Thankfully, Sky was a good brother. He'd happily carry his brothers for a ride if they asked.
And if they took his slot for dish duty.