Mom's Friends Nao Jinguji(2019)

Atsushi is taken to his mother's favorite coffee shop, where he meets his mother's friend Nao. Atsushi, who is at the mercy of her unadorned and free-spirited charm, finds out that she is her married woman, and once suppresses her feelings... Unable to suppress her rising emotions, he tells her of her feelings. Nao refuses, but she gets carried away by his momentum and ends up having a relationship with her. Since then, the two have secretly piled up their bodies and love each other. After a while, Atsushi, who has a gap in her relationship with Nao, heads to her shop again.