
The part about ruts I understand, but I totally thought they bit on the ear just cuz they were in the moment and its usually a hot place to bit on lmao I want more info about the marking is it a freestyle where any bite works fine like I've seen from a few omegaverse or actually only the ear instead of the typical neck?? -- Hmm... maybe I should watch the first story and see if there'd be a dialogue about it

I think you're right. The author do have the creative control how bonding works so technically any area can be a potential marking area in their abo world (tho I haven't read one that got marked in the butt but its hella interesting thoo if you know of one)
Some works don't even have bites and instead dabbles on imprinting. Well I guess the authors of abo's sticks to basic world building for that then free style the bonding rules that comes after (づ ̄ ³ ̄)づ

I swear I might have encountered ass bites but I might also be delusional HAHHAHAAH probably from a manga? That or it counted the ass bite as a mark aong with multiple other marks of various areas I dont think I've encountered omegaverse with no physical marking via bites like you say, Im curious now do you still remember the title?
If an Alpha bites in any part of the body even the ear ans counts it as a mark, the ass would have been the best spot