Yukina raised her son, Masaki, single-handedly until he graduated from college and successfully secured a job. With his employment, Masaki started living alone, leaving Yukina to live solitary life as well. On the day of Yukina's 50th birthday, Masaki invited her on a hot spring trip as a birthday present. During the trip, Yukina became excited seeing Masaki's body for the first time in a while. Masaki also got an erection upon seeing his mother in her underwear. The destination these two ended up at was…
