They are omegas but their heat isn't here yet, so outside their heat they can have sex with anyone but when their heat comes only their alpha can arouse them since they're marked.
I think they just literally bit each other. Because, the bite mark that the alpha makes to his omega appears during heat.
Could you image
Not exactly, the mark is permanent
Ahh okay.. It's quite rare to see an omega being top.
http://www.mangago.zone/read-manga/boku_no_high_spec_kareshi_sama/. Thought you might like this one ╮(￣▽￣)╭
I have read this before. Thank you. I'll reread this again. (≧∀≦)
..the twins bit each others neck??? Is it possible for an omega x omega? Or maybe the twins are not really omega?
I don't know anymore.
Btw, can't wait for their names.