[Emori Uki] Mother and Son Underground Resort (Bibo Soukan) [Full Color] [Amoskandy]

Widowed masochist Natsuho books a resort holiday with her young son Masataka, only to find their room is a hidden basement dungeon stocked with chains, harnesses, and toys — and the boy is more than eager to take over where his late father left off. Flashbacks trace her lifelong craving for binding and suffering while her son teases, denies, and straps in to claim his crying mother as his personal slave, even pulling another eager captive into the game who begs not to be left unfinished. The epilogue reveals room E-3 was secretly built for celebrity politicians and now thrives on word of mouth from mothers and sons who keep reserving it again and again.