Use coffin struggle 4 times while skipping though dialogue to save time then click the invisible option
This is from 4chan
Look m8, the second fight against iron maiden is easily the hardest in the entire game, It makes the sphinx fight look like a walk in the park, the main thing you have to keep in mind, is that as soon as you get the chance to choose what to do, don't lose any fucking time and struggle to take her hands out of your penis, never, absolutely NEVER allow her to keep her hand on your dick, because he's gonna fucking murder you in the next turn, after you push her hands off, keep and eye on your lust, try to use concentrate when you see it goes above 40 or 50, after that just keep using coffin break, once you escape from her hold you will get a scripted event in which she pulls you back in, just let that event end and when the game finally gives you control back, choose the third option, the one that is invisible, btw the second fight with the iron maiden always happens, even if you go full pacifist, you can rape all the bosses even at level one you just need to know what to do, also the game doesn't use a party system is always 1vs1.