"It's an AU my bf (Kobey) and I made so that we can design our own versions of the animatronics / characters in FNAF... And put anyone we want into it.
Specifically Springtrap in this AU takes more of a "monster" approach. Spring Bonnie originally has its own AI conscious that can be turned off when put into suit mode."
"When W. Afton dies in said suit, their consciousness merges. Springtrap is his own dude, basically. With both of their wants, needs, and ideals. And new ones of his own. His memory is scattered, and only certain things can trigger it to make him remember."
"There is not necessarily a "corpse" inside of there. The dead remains kept moving, growing around the suit, creating a "monster" rather than leaving a dead man inside of an animatronic. It left a LOT of this weird, endless black sludge. Yes, it stains."
"The black goo is "agony." Kobey designed W. Afton and I (Con) designed S.T."