My advice is to seduce her using the same techniques that women use to seduce other women. For example, your girl looks away, and you stare at her tits while she's not looking. She looks back, catches you, or just knows what you did, and you turn bashful, and your power is diminished. That's a dumb guy way to look at tits.
Here's how a woman would do it to another woman: she's talking to you and you position yourself straight on towards her, at 180 degrees, making full eye contact. As she speaks you respond to what she says with lots of little facial expressions. Then you look her straight in the eye, look down at her tits, linger there for a moment, then look her straight back in the eye and smile. An obvious signal that you think she has beautiful tits. She turns bashful and your power is increased.
Also, if she's talking to you and she closes her eyes and keeps on speaking while facing you, that is a signal that you should check out her tits, her ass, everything. When she opens her eyes again she will know by looking at you if you did it or not, so if you're interested in her then make sure that you do.
Now onto the main event. Just as men blow it when looking at a girl's tits, they also blow it when "making the move". If you presume either way: that you will either succeed or fail, then you are risking power that could be lost. The better strategy is to risk nothing, so nothing is all that you can lose.
Tell her that you think about her when she's not there, you think about how beautiful she is on the outside and on the inside. You think about holding her, and feeling her warmth. You say all this with lots of eye contact. Then you ask her: Do you know what I'm talking about? Do you want me to stop? Or do you want me to go on?
Now she can say either yes or no, but the only question she's answering is wether or not you should keep on talking. So your ego is not on the line, and is in no danger of being chopped back. If she says yes or no, your power is still strong. I learned this technique from a bi-girl, they are much better at this stuff than men.