M25|F23 Sometimes, when we have sex, my girlfriend lets herself go during foreplay and talks to me about what would turn her on. Every now and then she talks about wanting to have sex with another girl, but lately she often talks about sending photos or videos to someone and seeing their reactions. I consider myself very open and I intend to encourage her to let herself go more and more. Last week while I was masturbating her we sent a photo of her breasts, censored, to a friend of mine (I know him well and he's good for these things). She has never been so horny and wet, but after we finished she started having problems and asking questions. What can we do to do this kink safely, so she can feel less guilty and free to do it?

PS: My friend was grateful for the tits, but didn't believe they were hers