Ane wa Yanmama Junyuu-chuu

Based on the CG collections by Chinjao Girl. (チンジャオ娘。). "What's wrong? Do you wanna suck my tits? lol" Placed before scenes of his big sister's defenseless breastfeeding, this little brother finally gives way to his sexual drive...! Will he be able to impregnate her before her husband does!? (Source: DLsite English) Note: It has live-action AV adaptations: EYAN-181 (2022/05/17) and SONE-201 (2024/05/28).</i>

Sinful Sis

A sister named Honoka who likes her younger brother Hirokazu, that Honoka sees Hirokazu doing schoolwork with a woman named Akazaki, and she feels jealous. Then he ventured to declare his love and he really wanted a Sex Relationship with Hirokazu. But Akazaki heard a voice from the next room and he suspected Honoka was watching a porn scene. And the next scene is transformed into a sex between Honoka and Akazaki. (Source: Nekopoi and Has Been Translated and Edited)

Iizuka-senpai x Blazer: Ane Kyun! Yori THE ANIMATION

Iizuka is chairman of Baseball club and one year older than Toyomoto. Iizuka-senpai and Toyomoto-kun always go to school together because Iizuka's house headed to school past Toyomoto-kun's home. Waking up Toyomoto-kun every morning and getting him to the morning practice baseball club has become his habit. Until Iizuka finally had a passion for Toyomoto-kun and conveyed his feelings at the time of graduation. Since Toyomoto-kun also wants to go to the same high school as Iizuka, he has to study harder to get into school with Lizuka. With that they made an appointment for dating after Toyomoto-kun finished the test. (Source: Nekopoi and Has Been Translated)