Ok - got it!
Let's see if I have the facts straight:
The Facts:
You have a technique to pull threesomes.
It is a long process that takes months.
It requires a lot of effort.
You want to continue to pull threesomes.
You want to learn a new technique.
You have grown weary of your technique because you are meeting girls who have become psycho, obsessed, and head over heels in love with ya'all or the situation.
You want your b/f to be present or close by during your pick-up.
Your boyfriend does not have to participate directly in the pick-up.
You know of a PUA who has a technique you want to use.
You do not want to ask the PUA about the technique.
Do I have it?
Analysis:
Your technique to pull threesomes involves a lot of time and effort. As the time goes by the girls you are gaming form a friendship with you, and eventually an emotional bond with you and/or your boyfriend. After a period of time the friendship becomes sexual and you have a threesomes. You are not interested in a polygamous relationship and after a few sexual encounters you break off the physical relationship with the girl you are gaming. That's when the girl goes psycho because she felt a strong bond with you and you unexpectedly took it away
The problem is you are misleading your targets. You are running girlfriend game on them when all you want to do is get laid. I have a friend who makes the same mistake over and over and over again – he runs girlfriend game, then doesn't want a relationship and winds up with stalkers.
I think there is an easy solution to your problem: you should try to pull girls back to your place for a lay either the night you meet them, or within a few nights of meeting them. Usually a girl that has sex with you the night you meet her will not be looking for a long term relationship (at least, not at first, you can try to move the pickup in the relationship direction, but you don't want that right?).
Pulling one night stands is easy: find a girl who is talkative, start kino, if she responds positively invite her back to your place for a movie or a drink. It should be much easier for you to pull girls than a guy because girls are not used to being gamed by other girls and because you are a girl, she will feel more comfortable about the idea of going to your place. Also you are a model, who doesn't want to bang a young bisexual model?
One of the techniques you can try is to be direct: as you are starting kino (put your arm around her shoulder), say something like “you're adorable, I bet you would make a good girlfriend for someone special”. This statement is a good direct statement that is actually somewhat indirect because you are not clear if you are suggesting that you are the “someone special” or if it is someone else.
Then ask her about sex. Ask her where the craziest place she ever had sex was.
From there you can talk about how you have a boyfriend and how you are bisexual. This way you are making it more clear that you are looking for a ONS. If your target is game she will let you know.