This artwork is based on the ending of this story: >>7043034
https://www.fimfiction.net/story/564117/3/sexier-short-stories-with-particularly-pregnant-ponies/bug-shy

Fortunately for the guard, he remained outside of his queen as she left the throne room for some other part of the hive. Despite the title of guard, his main purpose was to help her move her swollen form at her leisure, and he was thankful she wasn’t yet so big that she would need two guards to help her shift her weight. Wordlessly, she began to rock herself back and forth until her giant rear left the throne, and he wordlessly sandwiched his back underneath it to act as a lift; his four shaking legs moved the queen upwards ever so slowly, and he knew if his legs failed him he would be smashed under her like a common bug, although there were worse ways to die. Thankfully, her thick hindlegs soon helped him, but not to get her standing, for she was easily far too large for standing to be possible. The work of his entire body and her legs amounted to nothing more than rotating her so that she lay on her belly like a knot on a balloon. Thereafter, her wings somehow lifted her into the air, giving her more of a teardrop shape as he lay on the ground watching her, struggling to catch his breath before he followed.

His queen was so majestic.