I'd say if everyone involved is ok with it...and both of you want it...go for it. Just remember that if you want the friendship to continue, communication is important. As for the photoshoot thing, well if you're comfortable with that, but you should probably talk first and see if she's opened to seeing you this way. Of course, if she's sending you signals, then do what you feel comfortable with. You are the one in the relationships. We could tell you..kiss her, do this, do that, but you have to live with your decision.