Yoshugara Hikaru and his little sister, Mioto, are childhood friends of Sugihara Hakuro, and Hakuro's little sister, Akimi. Although Mioto and Hakuro love each other, Hikaru is also secretly in love with Mioto. One day, Akimi walks into Hikaru&rsquo;s room whilst he was playing with himself while spying on Mioto and Hakuro. Akimi demands that Hikaru finds a way to break-up their sibling as Akimi also loves her brother. Hikaru refuses her but Akimi threatens to reveal his shameful act. Hikaru loses his temper and rapes her. Horrified by what he had done, Hikaru eventually agrees to cooperate with Akimi on condition that his indiscretions be kept secret. 
(Source: AnimeNfo)

Kokone was studying in her room one day when her twin sister, Izuru, returned home. Izuru immediately went to their elder brother's room and the two began to make love to each other. Being twins, Kokone and Izuru are able to share feelings of pain and pleasure. Thus, unable to resist the waves of pleasure, Kokone began fingering herself until both rooms simultaneously echoed with the twins' cries of orgasm. 
Annoyed at them, Kokone decides to steal their brother from Izuru. 
(Source: AniDB, translated and adapted from official site by Cranston)

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