Jealousy isn't really the word I would use here.... I think it's something more about feeling inferior to each other, and I'm not talking just in regards to Towa. Being twins I'm sure they were compared a lot growing up, especially when one turned out to be an alpha and the other omega.
So the twin not omegas? I thought the three of them (Ai, Sei, Towa) are omegas.
Seiji is an alpha while Aiji was an omega. Seiji just let Aiji bite his neck i think as a sigh that he loves him
So let me get this straight. They're twin. Both Ai and Sei love each other. Great.
But, Sei is an alpha (is he?) and Ai is an omega. So they bonded (or both of them are omegas?) Ai getting irritated to Towa because Towa can tell the difference between them. So they're not special anymore since what makes them special (in their head) is people can't tell the difference between them.
So, what the fuck is Aiji problem? Is it jealousy? But towards who? To Seiji or Towa?