What about Dean getting so jealous of Adam that he decides to drag Sam along to visit him?
The twist is that Sam is tied to a chair and has to watch Dean fuck Adam. Definitely border noncon too
Adam would definitely get the patented little brother treatment from Dean - yk, get forced into submission and fucked roughly. Dean is the big brother, he has the say and he gets to decide what to do to his family.
(Sam would be horrified because seeing it from the outside is a shock)














