Empty Heat by Wendy Rathbone

When Callum’s sexual dysfunction keeps him from true happiness, Omega Island is his last hope.
The private tropical island in the Caribbean specializes in sexual healing techniques for omegas who cannot be helped by traditional therapies.
Omega Callum suffers from narrow birth and anal canals. He can’t mate without extreme pain and no surgery can help him.
Alpha Lev is a sexual surrogate, skilled in the art of hands-on sexual teaching and healing, a profession not officially recognized in traditional medicine.
Callum and Lev spend a night of intense heat together where methods of pleasure are taught and learned.
Personal feelings develop which lead to difficult life choices, sacrifice and hopefully love.