BL Metamorphosis by Kaori Tsurutani, English published by Seven Seas. you can the manga on Amazon (link)
Ichinoi, a seventy-five-year-old woman living a peaceful life, unwittingly buys a boys' love manga one day, and is fascinated by what she finds inside. When she returns to the bookstore to buy the next volume, the high school girl working there--Urara, a seasoned BL fan--notices a budding fangirl when she sees one. When Urara offers to help Ichinoi explore this whole new world of fiction, the two dive into the BL fandom together, and form an unlikely friendship along the way.
I really enjoyed this manga, it is wholesome, sweet and simple drawn. a must-read if you're a Bl fan and is more relatable. 
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Please read my featured article: Boy Love (Yaoi) Manga Recommendation to Buy at CDJapan featured on CD Japan website: https://www.cdjapan.co.jp/feature/Boy_Love_Yaoi_Manga_Recommendation_to_Buy_at_CDJapan