If Yumi's behavior continues or escalates, it might be necessary to seek intervention from another trusted family member or a professional counselor.
Additionally, the trope feeds into the shota (young boy) and aunt/neighbor genres, which are immensely popular in doujinshi. The age gap (often 15–30 years) is a core fetish element. Kaa-chan no Tomodachi ni Shikotteru Tokoro Mira...