OMAKE
It was a cold night, everyone was supposed to be sleeping, except for the two teachers that were writing on the board of one of the classrooms. They were discussing seriously like they were planning a way to save the world, to win an impossible fight, lines and circles were drawn as they were erased, groans and low shouts could be heard from outside the door, fortunately, no one was there to listen to them.
"So we can both agree Annette and Felix should be a couple" said Sothis
"Absolutely, I mean just remember when Felix finally confess he was obsessed with her songs" said Byleth with an excited expression on his face. Sothis nodded in agreement and draw a line between those two names.
"Ok now, What do you think of Claude and Hilda?" asked Sothis while looking at the board thinking deeply as It was a complex equation
"Definitely, I was annoyed when I heard they didn't end up together when I choose the Golden Deer to teach" said Byleth determined
"I know, I mean they are both schemers and they can read each other... yes definitely" said Sothis nodding
Byleth drew another line in those two names, Sothis was still looking deeply at the board
"What do you think about Dimitri and Edelgard?" said Sothis
"Just for the shits and giggles?" asked Byleth
"Just for the shits and giggles" answered Sothis
"I was going to say Dimitri and Marianne but... what the hell, for the shits and giggles" said Byleth rolling his eyes with a smile while drawing another line between the names
"Ok I think It was enough for today, we can continue tomorrow" said Sothis while leaving the chalk near the board
"Mother, Byleth what are you two doing here at this hour?" It was Rhea who was in her nightgown
"Uh oh... we're busted dear" said Byleth which Sothis replied with a look saying 'Relax, I got it'
"We are shipping our students" said Sothis absolutely serious
"You what?" asked Rhea dumbfounded
"We are deciding who will end with who" said Byleth as It was a matter of life or death
"But you can't do that, you can't just manipulate the hearts of your students, you can't make them fall in love as It was a game" exclaimed Seiros a little angry
Byleth and Sothis just look at each other trying to restraint their laughter "She doesn't know what Robin did with the sheperds, right?" whispered Byleth
Sothis was chuckling softly "No, I don't think she does"
"Don't worry Rhea, It's just a game of ours, nothing serious, we know we can't do that" he lied as he breathed, of course, she didn't need to know they can do that, at least, not yet...
"That's good to hear" said Rhea relieved "For a moment I thought you were serious"
"Oh that reminds me" said Sothis with an innocent smile on her face, she approached the board and flip it to the other side revealing another board full of names "Which ones do you think will be great names for your future brother AND sister" said Sothis while touching her belly
"BROTHER AND SISTER" exclaimed Rhea with her eyes almost going off her head
"Yes, we are going to have twins" said Byleth as he grabbed Sothis by the waist a kissed her head. As tradition the vessel should have twins with her wife (For the reference look at 'A family member felt in love with the vessel of a dragon god, now with time travel!' - By Dr. Robin Grima, chapter 69)
Rhea immediately collapsed to the ground, damming the day she used that boy as a vessel for her mother
"I think she took it well" said Sothis while chuckling "Come dear help me to get her to her room" said while trying to put Rhea on her back.
While walking Byleth stayed silent in deep thought, after some minutes, near the door of Rhea's room he said "Her and gatekeeper?"
"I was going to say Dorte but why not?" said Sothis while opening her daughter's room, hoping for Rhea to believe that all was a dream so she could torment her daughter again