Jason,
Since you haven’t replied, that suggests my suggestion may not have been along the lines of what you have in mind. Perhaps you don't want to say anything that might clue your woman-friend in that you have the password to her FaceBook account...?
Anyway —the title on the subject line of your post suggests you want to establish a long-term relationship with your woman — a live-together relationship (LTR) or marriage — in which your desire is to be your (now woman-friend’s) submissive cuckold.
There’s nothing wrong with that. But, if so, you may be jumping the gun. Although your woman appears a suitable candidate to become your dominant partner who cuckolds you (because she seems already to be taking on that role), you should keep in mind the definition: “cuckold — a man with an unfaithful wife.” Thus, a preliminary challenge is to persuade your woman to become your wife.
Since your woman is Japanese-Australian (according to your post and her photo), if you are a Caucasian-Austrian (i.e., white), and you aren’t into bulking up to become a muscular hunk and getting tattooed (like your woman’s Sydney lover), you might find it helpful to grow a beard.
When you recover from laughing (if you are laughing), see:
“Are Men With Beards More Desirable?”
by Leslie Alderman
May 17, 2017, New York Times
https://www.nytimes.com/2017/05/17/...on=inside-nyt-region&WT.nav=inside-nyt-region
which includes:
“Science suggests that facial hair — from scruffy day-old stubble to full Grizzly Adams — is imbued with social messages, and can play a significant role in a man’s love life.
“Last year, researchers from the University of Queensland in Australia decided to explore male facial hair to determine what role, if any, beards play in sexual attractiveness, masculinity and short- and long-term relationships.
“The team gathered data from 8,520 women, who were divided among three groups. Each group of women was shown pictures of men with varying degrees of facial hair. ….. etc. ….. “
….. “When it came to choosing a long-term partner, a guy with whom a woman could have babies or settle in for the duration, the more facial hair the better. Men with heavy stubble and full beards were the clear winners on this question, suggesting that men who are ready to commit might do better if they shave less often.”
—Custer