Solomon/Gudao + Smol!Goetia

Solomon & Gudao: *taking care of Baby Goetia in Solomon’s arm*

I managed to get some time to finish the flats for this last minute piece for Pocky Day!

A huge disclaimer: I have read up here and there on ABO verse but forgive me in advance if some are completely wrong including mpreg with Servants. Because well... Given what the Holy Grail is capable of and our favorite hentai doujin artist who did the work.... Just take all of this with a damn pinch of salt OTL

Edit (24/10/21): decided to publish this headcanon out after watching Solomon Singularity movie from the feels

Gudao is the older brother and an Omega while his younger stepsister Gudako is an Alpha in the Fujimaru family.

From childhood, Gudako has been violently protective but also can be supportive if she sensed the Alpha either Gudao or said Alpha is someone worthy to protect and love her brother

With suppressants and behavior compared to a beta or an Alpha-like personality earning him a position as Student Council President in high school, not a soul once bat an eye on the thought he would be an Omega.

Gudako's partner is Mash, but there's a building harem from Kiyohime, Serenity and many other female Servants that showed interest in her as their mate.

As of now, Gudako has yet to mark Mash out of respect and desire wanting to take things slow due to Mash’s sheltered life in Chaldea. They have helped each other heat and rut, but were careful in not getting pregnant due to current circumstances.

For Gudao, however, when he first joined Chaldea showed interest and from growing friendship to love to the Beta doctor Romani Archaman. Both were drawn to each other due to sharing similar traits in their love for Magi*Mari and found at ease to be themselves.

But, their relaionship make Gudako worries for her brother future and at times violently threaten Romani to behave himself once the latter discovered by accident of Gudao’s scent when he visited his room to pick up the report when he was showering.

Her protectiveness also stemmed from the society where because a Beta and an Omega will never be happy together once the Omega found their Alpha partner.

But yet through all singularities and events, even meeting tons of other Alpha and Beta Male Servants, especially Alpha Caster Gilgamesh and Alpha Merlin, Gudao only have his eyes and still chose Romani to be his mate instead.

In truth before the start of Babylon a Singularity after Gudao remained to believe Romani is on their side despite Holmes and Old Man Hassan’s claims... Romani finally revealed his true identity to him and the reason why Gudao is drawn to him despite him being a Beta.

Romani Archaman is actually King Solomon, an Alpha Servant who wished for the Holy Grail to become a normal human. But because the essence of his true nature remain and unable to erase when he becomes human, it drawn him to Gudao and vice versa.

This also caused him problems especially when he was in rut, having to give himself excuse to hide from his fellow colleagues. Those who knew about his real Alpha status was only Da Vinci, and the previous Director Marisbury.

Because of his circumstances, Romani/Solomon proposed Gudao to wait for him until the Grand Order mission is over and when he graduated from High School

Gudao’s and Romani’s love unfortunately ended shortly when Romani/Solomon sacrificed his existence to give Gudao and his sister the opening to defeat Goetia once and for all

Despite the victory earn to save humanity from extinction, the price would have nearly broken Gudao mentally at the loss of his Alpha partner without his sister and everyone in Chaldea to help coping through the grief

While coping his grief, Gudako sensed two life essence within him. And her intuition proven correct when there were unusual symptoms of mood swings and vomiting of how a pregnant person was.

Her older brother Gudao was pregnant with Romani's children: a pair of twin boys for a month. The evidence was found in the last checkup note with Romani who done  it before they went off to defeat Goetia.

It had happened when Romani’s rut started before a meeting to conclude Babylonia Singularity started. And to avoid anyone to realize Romani’s alpha scent and even potentially on his true identity to be revealed, Gudao assisted his lover to bring back to his room to hide and to deal with his rut.

At the same time due to the stress that causes unstable cycle of his own heat, Gudao’s own omega heat started which in a passion any protection and contraceptive medications need to take were forgotten for that heated moment.

The doctor was conflicted whether to reveal this crucial information to his beloved which would forced Gudao to withdraw his position as the main commanding Master for the mission. Or, to keep it a secret until the mission was over to reveal, propose and finally mark his beloved Gudao as his mate once and for all.

Eventually he chose the former out of reluctance and his faith Gudao would come back safely and well with their children, knowing he and his sister went and gain through enough experiences and friends to survive against Goetia.

Gudao finally gives birth to his twin son Rehoboam and Menelik. Rehoboam his black hair and green eyes, while Menelik has white hair and blue eyes

Rehoboam has both Ritsuka and Solomon's former mature and confident personality, while Menelik is more closer to Romani's personality of being timid coward.

Gudako: I've decided to plan a party for a couple who got together recently

Mash: Who for, Senpai?

Gudako: My brother, Gudao, and Doctor Roman.

Mash: Wait, they're together?!

David: I am having another child.

Gudao: Oh... Wow, congratulations King Dav–

David, slamming papers down: It’s you, sign here.

Gudao: This is a marriage license and an official name change certificate.