The clock on the wall read 11:47 PM when Ethan knocked on the door of his best friend’s house. Mark was away on a two-week business trip, and Ethan had promised to check on his wife, Lena. He expected a quick hello and maybe a beer. He didn’t expect the look in her eyes when she opened the door wearing nothing but a robe that barely reached mid-thigh.

“Ethan… thank God you came,” Lena whispered, pulling him inside and locking the door. Her voice cracked. At 32, she was stunning, curvy hips, full breasts, long hair, and eyes that held years of quiet frustration.

They sat on the couch in...