“W-We did it, right? We sent Tirek back to Tartarus?”

“We did, Bumpy, we did…”

“…But, where are we, then?”

Twilight looks around, she remembers how overwhelming it first felt to be here herself, only to be comforted by the presence of her mentor, Celestia. As she recollects the memory, she can almost feel her smiling upon her…

“…Somewhere special.”

A moment from my personal self-ship AU between Portal Bump and Twilight Sparkle, this is depicting a moment from the adapted form of the Season 4 finale, wherein Portal Bump is responsible for opening the portal to Tartarus for the Rainbow powered Mane 6 to use, but it causes her to fall into an infinite loop of tearing an uncountable amount of portals open... until she suddenly lands here.

In my interpretation of the Ascension Realm (or just 'Caelum' according to an early draft of MMC), the realm changes depending on which Alicorn princess is present - thus it takes on a more purple appearance here alongside featuring Twilight's cutiemark replacing the stars in the path.