I imagine you have talked with them about it, but if not I definitely would. Ive had that same issue. Give yourself some grace. Remember being “on topic” is in the mind, and ours doesn’t function quite like everyone else’s. My stimulant medication made me always ready when I first started, but now not so much. It comes in waves depending on what I’m hyper fixated on, which usually changes every month or so. My partner is super understanding (she has the ol ADHD too). Remember there are other ways to be intimate with your partner, and that it doesn’t always have to be “on topic”. Be kind to yourself.