[PC] Gibo - Stepmother's Sin | 667 MB | 1 Link
So, there lived a young man with a modest name Yusuki Yagami. Lived, but not tuzhil, and the word "sex" ("sex") knew nothing, even as it is written. (Strange but true). Thus he lived somewhere up to 15 years (more surprisingly), when one event dramatically changed his childish world view. Once returning home earlier than usual from school, he found his mother, very active to change it to his father (that is their own husband). This event is so affected the psyche of an unstable childhood, that very soon our young hero of the word "sex" already knew all that is possible, it is possible but not recommended, and what not, but "you still were not asked (because this is where the dog fumbled!).