Can confirm, above method works, yellow/smaller choker for green and purple one, purple/larger choker for black one, regardless of where you subdue them/how (stealth from behind, front as they charge you (or you them) or approach black one either next to clock or table you get same stuff, so in total you have 3 failure scenes, and 3 subdue scenes, and green subdue scene is broken, ends with animation of her running in place and MC pulling his head back, same head movement I did after I got this same buggy animation 3 times in a row and decided there is not much else to do in this game (well more like demo).
It has huge potential, but game needs more development, more girls and most importantly more animations (bulges, x-ray, creampies, inflation, pregnancy, the usual, smh when devs don't include these 5 BY DEFAULT in every sex game, IT'S WHAT EVERYONE WANTS), and could use bigger mansions, with map (that gets drawn as you explore it), save system with safehouses (rooms succubi can't enter where you can sleep and watch the gallery, craft new items/potions/chokers/traps) and generally (since game isn't really scare), go for more lighthearted vibe, spooky, but not scary (jumpscares kill boners).