Hey I'm not one for talking but after reading a few threads on this subject I aproached the subject with my girlfriend of 7 years. She was so freaked out to start :-(
As probably mentioned a thousand times on here, if she's not into it to start the thing you need is TIME + PATIENCE! She needs introducing to the idea real slow without you getting to horny and ruining it
2 years and a lot of restraint later, we often share nights where she wears and wets too. I still have to show so much restraint though as it drives me wild :-)