Well, why not at least try being honest? What's the worst that could happen? Having to keep someone a secret isn't good for either of you, it's like being in the closet.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.