I have a ridiculously perverted sister, and one day it suddenly turns out that we're not blood-related! Shocking as it is, this is also a great opportunity! Now I can date her, and if I want to do something H with her, I can! It all depends on my sister's feelings now, but what do you know, she's been into me more than just as a brother! What a miraculous mutual affection! Now we can have incest properly!!
