Opportunity is knocking, her technique of masterbating with you blindfolded next to her is the seed you need to germinate. Her not being initially disgusted with other men possibly wanting to fuck her speech has to be furthered. Ask her "What if", "Do you think", and "Would you ever" questions on topic of other guys.Also how would she do it, and what it would take scenarios. A seed not nurtured dies but one tended to thrives. And all along you have to say how it turns you on to think of but not sounding to overboard. Some girls are born for this others need to be assisted to find it. Never push too hard but also don't stop pushing...good luck, you have a chance, the masterbating ultimately is replaced with Bull fucking her while you are near...now go out and get it done!