Lady Grey Question (Contains spoilers if you don't know Lady Grey Lore)

[Zinoraeth]

Marying Lady Grey and exposing her as her sister's killer?

Is it possible to do both? Since the only way to get to that one silver chest is to defeat thunder, and I really want to fight thunder too mainly because he keeps insulting me for no reason.

I know you start the quest at the guy in the cell and then speak to lady grey's sister's lover. Then you go to the grey house and find her remains. Then Grey gives you the choice of marying her or exposing her.

After you defeat thunder then you have the option to mary lady grey.

I am playing a good playthrough while trying to get the most out of the sub content like getting all the Demon doors, the silver chests and collecting legendary items while still trying to stay good.

Yes I am aware that somewhere I need to surrender all my silver keys which is why I havent collected any yet and won't until I reach that stage.


On a side note I have a weird bug while trying to open the Combat Multiplier Demon Door. On my evil playthrough I learned how you should do it with google's help ofcouse and I did complete it. But when I try it on my good playthrough I don't gain any Combat Multiplier- only skill experience.
The method I use is Ebony Bow Charging for a few minutes while I constantly slow time and dodge attacks. The attack did go through because it died but i got 0 Multiplier. I did another similar method too with Physical Shield and charging the bow while keeping my mana up but that didnt work either. On my evil playthrough I tried building my Combat multiplier in the cave but I couldn't get it high enough no matter how many times I tried. (More than 10 times changing my tactic slightly each time)

[Isus pali brat]

What happens in the lady grey questline if you kill Thunder and take his soul and after finishing that part of the quest you do the lady grey questline?
Does she just marry you or do they somehow make you fight Thunder again?