Prime Defender (Necessary Roughness #4)
Ann Jacobs

Keisha loves her buff, gorgeous sex slave. It is the ultimate erotic gratification—having such a strong, intimidating man completely at her sexual command. Then a health crisis forces them to make a temporary switch. The sex slave becomes the Master. Keisha is totally out of her element and they both wonder how they can ever really go back to that perfect love.
Reader Advisory: This book contains kinky public sex scenes involving multiple partners and ménage