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Why is that now every delinquent is getting a small child as a sidekick?!
This could very well be relevant to the demon world. We have no idea who Aiba is, and we definitely don't know whether "his" child is human or demon. If the baby's a demon, then it could be an introduction to the possibility there are other demon nobility who want the title of King. If the baby is half demon, Tamura sensei could very well world build on how demons and humans co-exist in the first place. We also can't entirely dismiss that Aiba isn't related to Kunieda.
I just think we should give it one more chapter before concluding whether or not this arc will be demon related. Personally, I'm hoping that in addition tithe theories I mentioned above, there is some other twist we have yet to see.
I didn't meen that it would be totally serious. Of course it always has some comedy patterns in practically every chapter, but still I think we'll have more of story development with lesser amount of comedy and fan-service parts in the upcoming chapters.