R.W. Clinger 
Below the Boarder [EPUB ebook] 

When sexy mechanic Dayton O’Hare moves into professor Nino Spiro’s home as a boarder, the two men are attracted to each other and romance blooms between them. Then Dayton meets landscaper Michael Block, and what unravels is quite simple: Dayton lands the landscaper, breaking Nino’s heart.But Nino keeps close tabs on Dayton and his new paramour. As summer unfolds, Nino indulges in voyeuristic fun, watching the two men at sexual play.The dynamics between the three men change dramatically when Block starts seeing Nino behind Dayton’s back. As their relationship develops, Block drops a bombshell — he and Dayton want to share Nino as a lover. Will they be able to make a threesome work?