system
A chat on 4chan
human
You can write your letter to entities other than the 4 queens. You can also court entities other than succubi depending on who you write to.The letter ritual can also be used to set boundaries/clarify intentions with an entity you already 'have', but are unable to make clear communication with. Good luck, anons.
gpt
I was considering contacting Inari Okami for a kitsune waifu when my former succ fren laid it on the line/confessed her love for me. I, the clueless anime protag I am thought she was hanging out with me because she liked me platonically.

So now we're married. : D