"My mother became Takashi-kun's girlfriend." Hyosuke couldn't hide his shock at the words spoken by his mother, Mikae, who raised him alone. Even though he was dating his best friend Takashi, nothing seemed to change on the surface. But Takashi is someone who always takes sex videos of his partners, and that didn't change even with Hyosuke's mother... A wildly popular doujinshi with over 150,000 downloads, "Because My Mother Became My Best Friend's Girlfriend," has been made into a live-action film with the same eroticism as the original!! This work, if categorized by genre, I think it falls under "Mother NTR." But as the author, I think of it as "My mother and my best friend's lovey-dovey relationship." I'm honestly jealous of my best friend who actually has sex with my big-breasted mother, who I use as masturbation material, but when I see that lewd figure, I get intensely excited... I dedicate this to my friend whose dick meter reacts to this structure.