Ardia Missionary Scene Requirements

[HLvL7]

What are the exact requirements (and/or measurements) for getting access to Ardias sub missionary scene?

I only get the greyed out option with the prompt:
"You need a cock or strapon small enough to fit. Ardia must be your lover, and you must not yet have sunk too deep into the clutches of addiction."

 

[Gedan]

Dom level <= 6, you need to have done her new event and picked the like her option.