small correction on what Side B said: yes, it is available. If you have unlocked Fia’s normal scene first, you can get it by simply unlocking Medea, that opens a path with the text: “Do you want to have sex, Fia?”
Within that branch, you’ll have to navigate yourself to get it. Fia is a little reluctant to give in, so you have to do your best to get her to cooperate, but it is possible! Good luck! :D
I can help, you don't even need that option, you can do this, first tell her she's cute, then ask if she has a trap, ask if she was serious, finally tell her your name, tell her it's not true you want her, ask if there is something she wants from you, say you can offer your dick, make her beg, and then the option "actually I was thinking of using your other hole" will show up, you must do it in this way or it will take you to the normal scene, if you can't assess this rote I don't know any other way as of now.
