I am looking for a book that was part of a series. I don't remember the title or author. The lead female character works for or owns an adult toy mfg. company. the lead male haracter is a housing contractor/restorer. The female character and the male character may be old flames/friends. She hires the lead male character to restore her gramdmother's home. While he is working on the house he overhears her on the phone plotting that she is ging to use him a guniepieg to test out a toy. He confronts her and of course refuses. I thing the series also has a book in whcfh a lead male character is a race car driver and a lead female character is a "life coach". I think the book cover of one of the books is yellow. Thanks to anyone who can help me.