Forbidden Love - Amor, #1

Jacob Freehan has no job, no man, and no motivation. In pain both from ending a long-term abusive relationship and a severe back injury, he escapes to the sunny seaside town of Puerto Morelos, Mexico for a little yoga, a little R&R, and possibly a place to quietly end his own life. Pakal is a centuries-old immortal Mayan spirit guide who has been charged with getting Jacob on the path toward healing.
Romantic involvement with a spirit charge is strictly forbidden, and it has never been a problem...until now. Pakal sees something special in Jacob, but failure to keep a rapidly growing attraction at bay could result in Jacob losing his life and Pakal being condemned to the Underworld forever....