>>396676650mm is good for this regardless of whether you are shooting APSC or FF. Don’t go any wider than 35mm FF, and don’t get close with 35mm. The zoom is good for your closeups. Start slow, don’t give a lot of directions right off, just start shooting and find a flow. Keep talking to her and try whatever shots seem interesting. If you already have good chemistry then she should get right into it and the photos will be great as long as you have the technical side under control. Natural light is easy for this kind of thing, but with modern cameras lamplight works just as well. Just whatever part of her you’re shooting, make sure there’s some kind of contrast and volume imparted by the lighting - I.e don’t shoot in flat light.
Look up Rembrandt lighting and try to apply that to whatever part of her you’re shooting.
