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Aiko desperately resisted her son who asked for her body. He tries to persuade his child not to go to the forbidden world, but his son has no ears to hear and forcibly approaches. Unable to resist the strength of his son who has grown up to be an adult, Aiko who thought about it decided to accept the son by deciding the rule that "If it is only the tip, it will not be etched". Two people who are connected only by the corona of glans and are absorbed in the play just before the forbidden world. However, Aiko couldn't be satisfied with just the tip before her son ...