So have been banging this girl every couple of weeks for 4-5 months. She's a good girl, never clingy, never really contacts me but always there when I need (if I give her enough notice). I met her in a pub with her best friend and her twin. I was with one friend (great natural game - although he has read the game). He ended up taking her friend home that night but didn't bang her-bit of cum on tits was all he could manage. Her friend had been going through long dry patch and think it all went a bit too fast for her. I went back with my now fuck buddy who had her twin staying with her in a very small studio flat. We got back later than her twin already asleep on the bed but ended up having a good old session next to her twin on the bed who pretended to stay asleep. My closest experience to a threesome upto now. At first I was thinking I could get a threesome with her twin but I have now found out her twin is a 28 year old virgin and is a bit weird and not as hot so have sort of laid that idea to bed. 
This new idea started this weekend when I met both fb and her friend at a pub very near my house after I had been at an all day party and was in very good form. I brought two cool friends but they were not in a good way from the party the night before and they hadnt met before so I took control, had the girls either side of me and had them eating out of my hands. Very alpha and I was dhv as my friends who are v cool were making me look good due there hangovers. I have always got on with her friend v well and nothing really happened with her and my other friend after the first time we met them. We got some coke again dhv as we couldn't get any and then a small time but scary looking gangster came in I knew who sorted it for me. As we were leaving to go back to party at mine I gave the friend a friendly hug n kiss and whispered into her ear that I really want to fuck her. She looked at me with a big smile and said she really wanted to fuck me to. I then closed the thread saying this was dangerous but should be discussed at a another time. All lighthearted but intention was there. Got back to mine after a hour or so me a fb go to bed to fuck. Really good sex - made her cum from anal (for first time) and went on for hours - coke helped. Friend stayed downstairs and neither of my 2 friends managed anything with her although I was encouraging it in a jokey way before I went upstairs. 
Now I know my fb has had a threesome or two before but I can't work out how attached she is to me as she never chases me and always say she is perfectly happy with an fb relationship. 
So now the question is how do I make my ultimate dream a reality (if they were virgins or twins it would be more ultimate I know). 
Most important question i have is do I have to discuss it with my fb first? Do I just get them round with sone alcohol and coke, then start dropping the hints? 
Also heard mentioned on the forum dual induction method, is that a massage thing? Should I research that? 
I do remember reading something on this forum re some sort of threesome related love system-shadow or something? Can't find it now any links or tips appreciated. Feel I should get this going asap to keep the work up I have already done. Last thing is if goes to plan i would love to make it a regular more relationshipy type thing with them both any advice on that would be welcomed. 
Right done now please discuss!