Lisa's Keeper by Kelly Addams

Lisa is maybe a little crazy, she loves a green cause to follow. So when she feels a connection with a forlorn looking gorilla in the local zoo... she sets about a plan to get him returned to the wild. But for her plan to work she needs to befriend chubby and balding keeper Robert... and so begins a most unlikely romance, and Lisa faces a life changing decision, betray Robert, or betray herself?