I just made a break through — kusucest: emotional incest
As we already seen with Kusuo and Kuusuke, the boundaries with them seem very thin and how kuusuke acts with Kusuo in general is incestuous in nature
This could make a headcanon of; no, they never actually did anything with each other. But one of or both of them thought about it and their issues within self and each other created this unhealthy and incestuous dynamic that followed to their teen/adult years


















