The boys next door were the two that everyone knew of as a pair.

Sebastian and Simin grew up together, and shared absolutely everything practically since they were born. Nothing could or would ever come between the two boys, everyone said.

But when you came in and quite literally got between them — their instant mutual attraction to you would do nothing but strengthen the bond between them. 

The boys next door shared everything. you didn't think that'd exclude you, did you?