Hey there, did you follow the walkthrough or how do you know that the greyed out option says "Fuck yeah"? You probably didn't let her check you at the beginning and flirted back. Should be explained in the walkthrough though :)
I didn't see that there was a walkthrough, thank you for mentionning that! It was because I didn't hang up during the call. In my mind it made more sense to keep the call up since she said she liked taken men, I thought it would play into her fetishes.
I finished the game honestly it's great work, hoping for more story with the sexbot !