Damn. I had everything enabled, and it's not an exaggeration to say I've submitted to Haunter (or was defeated by it) well over a hundred times before giving up and posting this. All kinks, male Lucario, no cage yet. Am I just getting extremely unlucky?
There seems to be a bug right now that only allows this ending to show when getting hypnotized, but not while submitting... Also these are the exact requirements, the chance should be 10%: -Male -No chastity cage -Not impregnated -Chastity kink must be enabled