What … she is 15 she already has a bit of conscious identety and it's a 3 year gap , if this was a 20yo with a 10yo , yes we would be in the eyebrow zone... however I don't want that a loving relationship that is proven to be concious, to become a case of abuse... tho I still believe that you are really only an adult at near 30's , you defenetly know what you're doing at 15 even if it's just experimenting, and noone should have the right to interfere with your Identety creation and moralize it, the most you can do is if it becames a grief issue is to help it threw therapy.