Reverse Netorare Fetish: Super Masochist Girlfriend

Mami is left alone while her DJ boyfriend Kouichi goes out after an awards event; on his forgotten phone she finds affair messages and videos with multiple women, including oral sex, and feels betrayal mixed with intense arousal that drives her reverse-NTR masochism as she masturbates to the footage. She lies that she will stay at a friend's house, hides under their bed, and voyeuristically watches Kouichi bring home a short-haired woman and have vigorous sex while she masturbates with a fixed dildo and vibrator in extreme masochistic pleasure. After confronting him with secret camera footage she confesses her reverse-NTR masochism, dogeza-begs him to show her sex with other women, and he invites Sana; Mami strips his pants and performs oral and analingus beside Sana's oral and paizuri, then Sana receives his cum and mouth-feeds it to Mami while Mami masturbates to climax. Kouichi lines nude Mami and Sana side by side, fondles and fingers both while comparing them, kisses and stimulates Sana's breasts and clitoris until she climaxes as Mami watches, then roughly takes Mami from behind with spanking until she orgasms hard; after bareback penetration of Mami, Sana mounts Kouichi for sex while Mami watches, licks, masturbates with a vibrator, and is forced to narrate, and he finally creampies Mami, leaving her panicked about pregnancy. In the climax of a bareback threesome Kouichi and Sana use long-haired Mami—gagged, fitted with a vibrator, repeatedly creampied, and forced through ahegao and squirting orgasms—while Sana taunts that a pregnant Mami would belong to them for life; afterward Mami realizes ordinary dating and sex can no longer satisfy her and that she loves Kouichi more than before. She keeps orgasming alone in the shower as Sana cools off with Mami's couple cup, skincare and towel then leaves saying occasional play like this is fine; later outdoors Mami openly flirts with Kouichi wanting hours of normal sex with him inside her and thanks him for awakening this side of her, and the story ends with another off-pacco DM arriving on Kouichi's phone.