If you've hit the target, she will agree with you and feel a connection between the two of you because she will feel you are both the same. At that point you can ask her about her favorite position or her favourite fantasies that she was never able to talk about or act on in a closed and conventional relationship. You can tell her about some mild fantasies of yours and direct the conversation to how wonderful it feels to be able to express yourselves in this way. You can even mention how talking about this kind of stuff is making you hot right there and then probe to see if she feels the same way. You can joke about the two of you trying to seduce another person together for a possible threesome and more depending on the fantasies she already told you about. If everything clicks you will know because if you don't go for the close, she will."
See also The Ideal Guy routine for a similar approach and GM technique explained for more details on overt sexual talk.
