A/B/O where Omega Shoto needs to have his suitors approved by...

And from the moment Shoto started talking about two Alpha classmates Bk and Dk, Enji knows one or both of them is gonna come to ask for his permission.
And then the dread starts to set in a bit. Bc he can't figure out which one will eventually ask.
So yes Enji realizes, as they get ready for the final battle, he would be okay with either of them.
He hopes Shoto is ready to make such a choice between his two suitors when they officially start courting him.
"Oh, so now we are finally doing it," Enji thinks to himself and prepares for the meeting with BkDk.
"We want to ask for your blessing to court Shoto!" Dk pipes up. And Bk gives a gruff nod to assert his agreement.
Bk: What are you talking about old man?
Dk: Why would Shoto choose only one of us? We both want him and he seems to want us both.
Enji: Well he can't have two Alphas.
Bk: Says fucking who?
The thought was laughable, everyone knew how possessive Alphas were of their mates, the idea that these two Alphas were both willing to share his son was not one he'd considered.
Dk: I would share anything with Kacchan because I know he'd treat Shoto as if he was the most precious thing in the world.
It was a cliche in stories at this point of two Alpha friends becoming enemies over a falling out over a mutual love interest.
But there was something they were not considering. Shoto.
They were seriously asking Enji to allow his precious son to be known as one of those Omegas that took two concurrent mates.
Enji could not bear to imagine Shoto being labeled that publicly if both BkDk were to mate him.
"I do not accept your courting of Shoto."
Silence.
"...what?" Bk said flatly, and Enji saw small pops start to come off his hands.
"I would approve of either of you being Shoto's future mate, but I can't accept it being both of you. I do not give you my permission to court Shoto."
"You think we need your *permission*? Okay let me make this fucking clear, we are doing this bc Shoto wanted to give you a chance to do this right.
"And? They would be my kids too bc I said so!" Bk barked. "Get with the times old man! The three of us are fine with this.
So here it is: We are dating Shoto and both plan to mate him, and each other, and how much Shoto talks to you after is gonna depend all on you."
"I see."
Beat.
"I guess all I can do is say I accept."