Ohashi-n chi no Obachan(2019)

Hanako gets excited when she sees her college student's son's friend, Jun, and seduces him with her lewd underwear. Surprised, Jun is worried that Kazuya will see this, and pushes Hanako away, but is at a loss for what she can do with her daring temptation. Even after Kazuya arrives, Hanako continues to seduce her Jun, but this time she shows off her secret part with more lewd underwear. After that, when Kazuya leaves her seat, Hanako rushes to Jun as if waiting for her, and Jun, unable to resist her temptation, eventually develops a secret relationship with Hanako.