how do I get her to get a threesome?

[sharkbeat]

Alright, my girlfriend is probably bisexual. She's been saying how she likes looking at girls in short skirts. She even asked me if I'd like to have two girls on me one time after we had sex. But the problem is, I have yet able to get her to do it! and I am asking you fellow DJs, what kind of mindset should I spin my head into to get herself horny enough to invite one of her girlfriends (she's got plenty of hot ones).
If I keep pushing it, I am sure she'd back away. If I never talked about it, I am sure she would think I am not interested. Throughout our relationship, that subject has been brushed lightly every now and then, but it's not enough to make her do it! So, how do I do it just right?

 

[sharkbeat]

That's the question! I know (and she knows) she has her inner *****, but how do I do it? Do I need to make myself buffed like Arnold that she can't keep her hands off me or what do I need to say or do I need take her out somewhere, get her something? I have to play my cards correctly.