[Kamiya Ogawa] Ore to Kaa-san no Shiawase na Katei [Kinsei Translations]

A widowed office worker walks into her son Kousuke's arms for a 'hello kiss'—a family custom he insists is perfectly normal, even as something deep down tells her it isn't. Her huge breasts straining against her suit, she squirms through his teasing about being too sensitive and secretly masturbating, weakly protesting that she's his mother even as cowgirl turns into a creampie and he's still hard for more. By the final round she's presenting her big ass on her own, fully convinced that sating her son's lust is simply a mother's duty.