Cecilia & Sirin

Cecilia & Sirin is the family ship between Cecilia Shariac and Sirin from the Honkai Impact 3rd fandom.

Canon
During the Second Eruption, Cecilia is in command of a squad of Valkyries to fight the Honkai in Siberia. She and Siegfried are then pulled into a dream world Sirin created using one of Otto's Fenghuang Down feathers. Sirin wanted to create a nightmarish world for them to suffer, but the feather instead conjured up the dream of them in a happy family celebrating Kiana's birthday. Sirin goes into the dream world with the intention of ruining their happiness, until Cecila treats her like their daughter. She gives Sirin a slice of birthday cake, and Sirin cries, remembering the cake her own mother made for her. Sirin lays in bed, confused at why she hasn't killed them. Cecilia lays in bed to holds her, and Sirin falls asleep.

Once Sirin wakes up, Cecilia drags her to go shopping at the mall. Sirin is hesitant to do anything, but ends up quietly enjoying the activities. They also go shopping for dresses, with Cecilia gushing about how cute her daughter looks in each one. However, when Cecilia moves to give her a hug, Sirin stops her, knowing that Cecilia isn't her real mother. Later, as Siegfried discovers that they're trapped in a false world, the glass of the mall shatters. Cecilia jumps to hug Sirin and protect her from the glass, and tells her their magic spell: Ich liebe diche.

Sirin is conflicted, since Cecilia made her feel loved like her mother when she knows she isn't. She then realizes Bella is hurt in the real world, and gets angry at Cecilia and Siegfried from distracting her. She stabs Siegfried, and gets even angrier upon realizing that Cecilia knew the entire time that she was in a dream world. Welt activated the Selene, disrupting Sirin long enough for Cecilia and Siegfried to escape.

Sirin is enraged upon seeing Cecilia again the real world, saying that Cecilia only pretended to love her when she wanted to kill her. She traps her and Siegfried in infinite corridors then battles with Theresa. When Cecilia makes it out, Sirin's Gem of Serenity was taken out and her Void Core broken. Cecilia used her Shariac blood and the Abyss Flower to cleanse Siberia from the Honkai corruption caused by Sirin. Knowing Otto is going to send missiles at them to kill Sirin and Siegfried, Cecilia used the Abyss Flower to shield him. She then went over to Sirin and holds her. In their last moments, Cecilia shares that she truly wanted to a mother to her when she witnessed Sirin's pain, then once again utters the words Iche liebe diche.

Several years later, Otto attempts to make a clone of Kiana Kaslana to serve as the vessel for the 2nd Herrscher. All the other clones failed to gain awareness, so he planted Sirin's Herrscher core in Subject K-423. Sirin's consciousness yearned for a second chance at life in order to experience Cecilia's motherhood again, and K-423 awakened.

Quotes
"In the illusion, I saw your loneliness and pain. I genuinely wanted to be your mom and make up for everything you lost. But at time, I couldn't change anything. The least I can do is to... Let you feel warm at your last moment. Sirin... Ich liebe dich."

- Alternate translation of Cecilia's last words, Chapter 24.

"As for Cecilia... She did feel for Sirin, but love never prevails against hate. In the end, she had to resort to violence. They murdered Sirin together - people who tried to save her in your eyes. Their kindness and care were only a joke."

- Herrscher of the Void, Chapter 25.

"She wanted to hear Cecilia's voice and feel her warm embrace again. She longed for hope and happiness. She kept whispering the loving words Cecilia said to her. All this was engraved onto the Herrscher Core and transcended time to pass her final prayers to a new life... That's how I came to be."

- Kiana about Sirin, Chapter 25.

Fanon
Cecilia & Sirin doesn't have a lot of fan-made content, but it is a popular ship in the fandom, especially for those who have read the Second Eruption manga. Fans find the story of their relationship sad but well-written. Many works have alternate universes where Sirin is adopted by Cecilia with Kiana as her sister. However, many works with Cecilia and Sirin's relationship remain untagged on AO3.

Fandom
FAN FICTION
 * Snippets of Sirin Shariac's life by BestgirlEmm on AO3
 * Null and Void deaths by Rush_Alias on AO3

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