Incest [silent] Incest - my dad is next to me...

Kiyotaka couldn't forget the swap experience involving her mother Eriko, her aunt, and her cousin, and was in agony. Eriko hushs to her son, "Let's forget about today," but Kiyotaka can't forget about her mother, who is drowning in pleasure, and is driven by a forbidden impulse. Then, when Eriko is forced to hold onto her son, who has lost her rationality, she desperately silences her voice right next to her husband, and falls into forbidden pleasure...