I'm honestly so relieved other people are pointing out how not okay it is for the omega to be a minor. In general, I'm shocked at the number of yaoi stories I've seen between minors/adults or even smut between two minors. It's not okay. Yaoi (and especially omegaverse) has lots of issues, but the frustrating part is it would be so easy for authors to avoid sexualizing minors. Just age up your characters.