Blake becoming Ambrosia is one of the possible endings but it's worth pointing out that she's not some kind of magical being but rather Blake's inner spirit fighting the purpose he was given even before his birth. So, it essentially works like this: agreeing to follow Ambrosia means conflicting with Dominique, and vice versa. If your Blake is totally submissive, he may end up looking a bit like her but wouldn't be Ambrosia in actual sense.
Yeah, in that scene of the render I posted, they talk exactly about that.
Ambrosia is a result of Blake's lonely overthinking. About the submissive route, Blake, at some point before going to Deliverance, dreams with Iris and Stu. Blake is restrained in a laboratory device, and you can see a horrible Bimbo Blake haha... Oversized tits and lips.

Well, truly, I don't need a spoiler about the sub route.
edit: "Blake's inner spirit fighting the purpose he was given even before his birth." Crazy but incredible.