>>63934327They have been living together for over a decade. They eat together. They sleep together. They work together. They socialize together.
There is not a single second of their lives where they aren't together. Now, saying they have sex with each other is a bit of speculation. But there is a zero, ZERO percent chance that they are not completely used to masturbating next to/ around each other. They probably sit at the PC doing work while the twin is 2 feet away grinding balls deep on a bad dragon pussy destroyer