Follow Me by Tymber Dalton

Askel’s frantic to help Mallory find a stable recovery from her anorexia, but every time he gets his hopes up another relapse threatens her survival. He’s willing to do anything to save his wife, including setting aside their Master/slave dynamic, if that’s what it takes.
Mal knows she’s in the fight of her life, but she’s hit yet another plateau and her recovery has stalled. Something has to give before her body gives out. She’s willing to take matters into her own hands and try a new path, even if it’s one Kel and her doctors disagree with.
Kel isn’t happy about Mal’s decisions, but it’s not like there’s anything he can do about it now. And when she issues an ultimatum about their relationship, he’s even less happy. Can he learn to let go, trust Mal, and put his faith in their friends? Or is he standing by and following his wife down a path of self-destruction?