When I reunited with a former classmate after a long time, she had completely transformed into a lewd wife. Shortly after meeting again, we couldn't suppress our desire to see each other and have sex, and we ended up in a friends-with-benefits relationship. The story depicts how they become immersed in sex, forgetting their daily lives. While asking, "Which is better, me or your husband?" she blurs the boundaries between friendship, adultery, and a sexual relationship, pleading, "Will you let me have your sperm again today?" A thrilling relationship begins, shifting from classmates to fuck buddies.