Embark on a tantalizing journey with 'Stamp Collecting Straight Man: The Promiscuous Couple,' a Chinese web novel that delves into the realms of ecchi, romance, and yaoi. Join the unconventional duo in a modern-day setting as they navigate through themes of incest, R-18 encounters, and thrilling threesomes. With a touch of smut, this story promises a rollercoaster of emotions and desires for the readers.