Sister Breeder

Episode 1 - 3 - Sister Breeder
Shouta is very affectionate towards his sisters Rena and Aina, they grew up as close siblings. Day by day, he becomes more affectionate towards Aina... and eventually he even sneaks into her room at night!? Rena tries to stop Shouta, but ends up receiving his affection in Aina's place. Due to her hidden feelings for Shouta and the pleasure of experiencing things for the first time, the once innocent Rena is steadily being trained by Shouta...!?

Episode 4 - Akuma de Kanojo wa Boku no Tenshi
This is a forbidden love. Timid teacher Makoto tries to suppress his feelings for his student Mano. But one day, Makoto finds out Mano's secret, and with an angelic smile, she starts making devilish demands! Mano seduces him with various types of play. However, in order to melt away Makoto's hesitation, she provokes him into serving her...!? A pure love story of a devilish angel!

Episode 5 - Zettai! Zettai!! Ojousama♡
Kaede, a beautiful young lady with excellent grades, has absolutely no knowledge of sex. Having been raised to stay away from sexual activity until marriage, she reacts by… begging Akito—who’s rumored to be quite the pervert—to teach her about sex! After voraciously absorbing Akito’s eccentric knowledge of video games and anime, the young lady becomes completely hooked on lewd acts, and her sexual demands keep escalating…!?

Episode 6 - 3M Kanojo
Karen, the object of admiration for the judo club members, had always been uncomfortable around Tooru—the only man who had ever defeated her. Ever since that loss, just catching a whiff of Tooru’s scent sent a wave of pleasure coursing through her entire body. One day, unable to hold back any longer, Karen tried to sneak a sniff of Tooru’s clothes in his locker—only to be caught by him. Seeing her like that, Tooru, too, lost his mind…!?

(Source: Lune-soft, translated and edited)