From Source:

Even with Aj's recent freakish growth spurt, Rainbow Dash laughed off the larger mare's boast that she 'could probably swallow another whole other pony'. But having witnessed the mini-giantess gulp down her own brother and second largest pony in town Big Macintosh, and now watching her massively distended gut gurgle and wriggle about as said stallion attempted to get comfortable within, Rainbow could only stare on in awe, fear, and excitement.

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A piece I started for-fuggin-ever ago but could never finish. You'll recognize it as the bottom middle sketch from this page: https://www.deviantart.com/ninegates/art/Macro-Vore-Sketchs-6-16-20-871722967