Female led relationships discussion

Looking at this so far, I haven’t seen anyone address my question yet. I recently asked my former girlfriend to hold the key for me. She’s one of the most wonderful people in my life. We’re close friends and she understands me better than almost anyone else. My marriage is sexless (I probably haven’t had intercourse in over five years) and she knows that fact. Even though we live apart, she’s willing to take on this role once she does enough research to feel at ease. Because our arrangement isn’t a standard one involving chastity, what benefits can each of us expect? How do we keep it engaging and mutually rewarding?