Estus is a female protogen filled with Estus Potion liquid owned by Jangotoss aka DalisBlackfire https://www.furaffinity.net/user/DalisBlackfire/

Estus is based on the Estus Flask from Dark Souls. The Estus Flask contains Estus Potion which is used to recover HP. https://darksouls3.wiki.fextralife.com/Estus+Flask

Estus's belly and breasts are massive containers of Estus Potion, and do not contain other organs. Other characters can drink "milk" from Estus which will heal them. Alternatively, characters can be vored by Estus, allowing them to swim in their potion belly - instead of getting digested, they get healed.

Estus is 460cm tall (15ft 1in). Estus weighs 25 tons (25 Mg or 25,000 kg) when filled, or 10 tons (10 Mg or 10,000 kg) when empty. 60% of her body mass is the estus potion liquid.

Estus is primarily yellow thanks to the yellow liquid inside her combined with her transparent belly and breasts. Estus also has yellow/orange fur down her back and tail, she has red horns, the underside of her tail is red, and her visor is blue with a yellow face.

Estus is a former dragon, so she should be tagged dragon hybrid as well as protogen.

Estus is the wife of Jango, a male grey protogen.

Reference sheet: https://i.imgur.com/szPLNzE.png