After living together with my stepmother and wife for a year, my father-in-law suddenly passed away, bringing our family closer. One day, my stepmother unexpectedly announced she wanted to become a lingerie model. She had secretly applied without telling my wife, and when she revealed she'd been accepted, my wife strongly opposed it, refusing to discuss it further. Confused and troubled by my wife's reaction, I accidentally caught a glimpse through a crack in the door that night and saw my stepmother in lingerie. Her expression and appearance, unlike anything I'd ever seen, instantly captivated me, stirring emotions I'd never felt before.