Would it be wrong to masturbate with her? We talk about masturbation and technique all the time. Plus, we've seen each other naked, and we turn each other on incredibly. She doesn't think her relationship is going to last, as he lives two hours away. We both intend to get together (in some way) when they break up – but would it be wrong to play with each other now, as friends?
I don't particularly think so, but a lot of it has to do with the relationship your friend has with her boyfriend. Does she think he would mind? Would she tell him about it? If he would consider her masturbating you an act of betrayal, it probably isn't a good idea. You and she will have to figure this out based on the dynamics of the relationship. You can never go wrong waiting until the relationship is over to start playing sexually. Also bear in mind that it's very easy for a friendship to be damaged by going sexual; it takes a lot of maturity for a couple to stay friends and non-romantic sexual playmates.