>>52325244Okay, look. In the current digital age, it's becoming less and less important to build relationships. And when someone is socially anxious, some of it could be genetic and thus both siblings have it.
Now, when you put horny, lonely, anxious people together, they tend to become sexual. Add to it that due to their anxiety their sibling is the only one they can be open with.
It need not be sex, but just oral or touching can be relieving.
