I can see MoomanXKrono's dynamic being like, Bromei being this awkward scholar who, due to being a total geek, thinks Krono is unironically cool. Krono takes him under his wing because he's too cool for school...but he still needs to pass so he initially befriends Dudemei just to get free tutoring.

As the two get to know each other more, at some point Mooman starts to realize Krobro isn't some gigachad and so he starts sneaking in some barbs here n' there. Krono's too dense/egotistical to notice Mooman's being sarcastic. An universal constant for Kroniis is that always start as a top but eventually slide down to becoming a bottom. Thus, what intially starts as an uke/seme relationship becomes a more balanced codependency as Mudude learns to become more confident and Krobro opens up emotionally and allows himself be vulnerable again.

This shit writes itself!