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)

Sinful Sis(2014)

🙂 62%

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Sinful Sis.css-1qyv5d2{margin-left:0.6rem;font-size:0.9rem;color:#6c6c6c;}@media (min-width: 481px){.css-1qyv5d2{font-size:1.2rem;}}(2014)

🙂 62%

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Sinful Sis(2014)