This comic is based on the following short story by Kassaz:
https://www.fimfiction.net/story/526921/20/short-stories-with-pregnant-ponies/the-miracle-of-flight

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Fluttershy grinned while arranging the pillows and dolls in her foal’s crib. Her new nursery was perfect, all remaining was to add her foal. She turned to smile at her wide yellow side, but her excitement was cut short by a whistling kettle on the stove.

She paused at the top of her stairs. She gently began to descend—her sensitive belly scraped against the steps—and backed up. The kettle was whistling more loudly now. Her husband was at the market; Harry, the bear, was asleep. She couldn’t figure out how to get down. Fluttershy began to shake.

She jolted when Angel kicked her leg. He pointed at her wings. “Oh, right. Thank you, sweetie.” She tried to kiss him, but he plugged his ears and hopped away.

Fluttershy gently floated down, high above the stairs into the kitchen, and started to make her tea. She smiled, thankful for her wings.