Based on the details, this is most likely from the Japanese manga series (初恋限定) by Mizuho Kawakita . In that series, there is a character named Ayumi Takeda (often spelled Takeda Ayumi), who is a middle school student — around age 14–15.
It sounds like you’re referring to a specific work or scene involving and a 15-year-old character named Ayumi Takeda . hatsukoi takeda ayumi 15 sai