Original: https://www.pixiv.net/en/artworks/111666028
Description:
The evil, motherly (1000 children) demon girl-chan loves to attack human settlements with her children, trample on helpless people, and mate with male demons.
She is sealed from giving birth by a righteous sorcerer who protects the people, and is punished by being tormented eternally by intense labor pains that assault her huge, tight, bulging belly that is packed with 10 baby demons.
The entrance to the cave deep underground is sealed so that no one can find it, and it is said that demon girl-chan's moans continue to echo in vain through the passage...

Notes:
Edited MTL of something I wanted to read.