Poor Poor Sora
Where do I start? Do I even really want to start? You have a wuss for a main character who basically lets everyone boss him around. Seriously, he has no spine. Granted most men do not have a spine when sex is involved. Still, he could have pretended to have some sense of dignity and of what is right and wrong. Seriously, what is wrong with that guy? Really what is wrong with his siblings.
First you have Aki, who takes advantage of Sora. In all honesty I think there is a lot more wrong with Aki than the series let out. Seriously, what kind of sister, who looks like Aki, goes out of her way to seduce her brother? It is just weird... and wrong... poor poor Sora. Then there is his other sister... god what is her name.
The obsessive lesbian, I felt really bad for her up until the end of the series. After all she is hopelessly in love with another girl. However, this other girl is hopelessly in love with her brother. Her resentment is understandable. However, how she handled her anger was.. yeah.. couldn't she just have killed or maimed Sora? I mean seriously, what would have been so wrong with that?
All I can say is at least all the characters in this series were close to the proper age. That is the only way this could have been more disturbing. If this anime was loli.