very easy...for a start, try to ask slowly... this kind of questions..
1. what do you wear to slepp ?
2. what are you wearing now ?
3. do you wear bra/panty now ? what colour ? (just say you love that colour).
if she willing to answer all this question. then you kiss her on the phone. and say she got sweet sexy voice. tell her that her voice is making you horny.... see how is her reaction....
if a gal can talk all this... means "anything also can liao"