Don't know how I feel about Diego. And I do want there to be an end, I just want to end when I'm done, not when the timer runs out. Could even have the best of both worlds in the future. You need to survive for a set amount of time until the military arrives and starts sorting everything out, after that you can leave whenever you want. Sort of how after you beat lethice in corruption of champions you can ascend whenever you want to enter ng+.So you can go to diego and use the "trick" option with him. If you pass the roll you can get like two extra weeks. Enough success and you can trick him into drinking orc cum and be available for sex w/ you. Also you can cheat w/ trixie and turn on the one that makes it so theres no end. I also don't really like transforming away from human and so you can do the shifting quest. Look up shifting on the wiki, it will let you transform into anything you want. It will lock you out of an ending though. If you do want to go back to looking mostly human I'd suggest the spartan or knight transformations.
And I don't want to be human, I just want to be a rat, or maybe a fox. But neither of those are easy to get, and unless I'm a researcher they're even harder to keep. Although, from what I've read on the wiki, only arctic fox is available, and it's still easier to get than the slut rat quest to get mall rat.