[Karashina en] Hitotsu Yane no Shita de Kaa-san ga Netorare Teru~Tomo Chin ni Ochita Haha to Sore ni Mezameru Ore 2~ [Fated Circle]

What starts as a favor — looking after her son's friend Ryou while his grandmother recovers — becomes a full-blown affair a pregnant mother can't quit, even with her boy under the same roof. She services him with shameless enthusiasm, begging for ball play between breathless blowjobs, then lets him embrace her from behind at the stove, freezing mid-apron when her son walks in on the near-caught moment. When Ryou's oblivious mother arrives to whisk him home, the household is left holding a secret that's already begun to show.