Kabane and Kon are a really strong couple, even not romantically. They're both beyond socially inept, but in vastly different ways. While Kon is just completely uneducated about society, Kabane seems to lack or lack an understanding of emotions/empathy. At times they appear to be super similar, such as the chapter with the cat where they both immediately set off to find her without even waiting to hear the plan.
At least, that's what I think.