This a pretty hot work, but i have few things to point out:
1,- He said "She is my elder sister and childhood friend" Q: I know your siblings cant be quite friends... but if you are in good term with them... Why say it like that?
2.- I can understand the translation, but, there are some stuff off or its just me?
3.- If first point is true, then can i add the incest TAG on it.