Just be friends to me reads 'I don't want you to put it up my mimsy, but you can do me in the chocolate starfish'. At worse you could get her to fist you! If she can get both hands up ther and not clap, then the job's a good 'un!
If I was you I'd be more direct about your intentions, just get your old boy out over a latte and a flapjack. Works for me every time 100% guaranteed.