Xey

Alright searching for a very old story. It had a very strange combination of fetishes, so I have been reluctant to tell others I am searching for it. But after years of searching .... I need help. It was about two guys in a large building or institute. Something bad had happened to the world and this was a safe haven. For exchange for staying there they had to wear diapers for extended periods. The people that ran the place used the stuff in the diapers to power the magic of the facility. After processing certain amounts they could earn higher rewards, including learning how to use magic. Only the first two chapters had excessive diaper content. The second two chapters (or chapter?) were mostly furry. The two characters had earned enough to learn magic, one got turned into an equine with shapeshifting capabilities. The other ended up with a stretchy or rubbery body. Major rare fetish of all the way through in that part, where the horse friend was casting a spell that required his cock stay inside the friend for an extended period. Then one of the other higher ups requested a sample of his cum. So he forced his cock the rest of the way through his friend so he could supply the sample. The last part ended up with the friend forcing his cock into the cock of the horse anthro, getting it stuck and ending up with his balls getting heavily inflated. He went to sleep woke up pregnant and now a hermaphrodite. (there were also some repopulating animals to the world subplots too) There was so much more I remember but those were the major plot points. PLEASE help me find this story!