In Sickness and in Health: Love, Disability, and a Quest to Understand the Perils and Pleasures of Interabled Romance by Ben Mattlin. This well-researched book, written by a disabled man who has a nondisabled partner, is fifteen chapters of interviews with other interabled couples.
Travelling to Infinity: My Life with Stephen by Jane Hawking. This memoir by Stephen Hawking's first wife, Jane Beryl Wilde, is the story of their marriage.
Strangers Assume My Girlfriend Is My Nurse & Laughing at My Nightmare by Shane Burcaw. As a lot of you will know, these books are written by Shane from Squirmy and Grubs. (u/geoffw79 has linked their YouTube channel).