A booking mistake leaves two young married couples sharing the same room at an inn. Mai Honda and Reona Hironaka, two women with completely different personalities, boldly trade partners in the mixed hot spring and turn the trip into a wife-swapping getaway. Each husband eagerly licks the unfamiliar married pussy in front of him, but jealousy flares when he hears his own wife moaning harder beside him. He responds by thrusting in bare and pounding his new partner until she cries out in pleasure. After watching his wife cum again and again on another man's cock, he finishes by filling the other wife's womb with a deep creampie, as if making her decide which man felt best.