*During a medical check-up with Dottore, Sandrone answers questions about her injuries*

Dottore: I know you handle the maintenance of your mechanical parts yourself; is there anything else I should know?

*Columbina listens intently*

Sandrone: Guillotin also replaced parts of my heart that had been damaged.

Dottore: Do you have any resulting heart conditions?

Sandrone shakes her head: No. Sometimes my heart beats very fast and it hurts, but there’s no difficulty breathing or any serious ailment.

Dottore: And your spinal cord?

Sandrone: No. My legs, arms, eyes, and parts of my heart were damaged, but not my other organs—like my stomach or uterus. When Alain examined me, I learned that I can conceive.

*Columbina remains silent*

Columbina in her mind: "Her uterus wasn't damaged; she can conceive, she can carry children—my children, *ours*... demigod babies."

*Dottore guesses what Columbina is thinking, and his big bro instincts kick in*

Dottore about to bring out the sandal of punishment. Like, NO demigod babies BEFORE marriage, you horny Goddess! 😠

Yandere batfamily x Sandrone! MC

Reader was a Sandrone-like girl who was neglected and abused by all the batfamily (except Alfred who taught him baking and piano and Barbara with who sue shared her mechanical invents) she ends up in teyvat (a separated world/continent than an isekai) and for an accident she was founded by guillotin who saved her life replazing her body parts for some mechanical ones and with time she joined the Fatui harbingers as Sandrone

She may be in love or relationship with Columbina o Dottore

I haven't done a neglected Batsis au in a bit, and the MC being 'Sandrone' has my attention! 🤩

And oh, the pairings! Makes me imagine that she could be in a relationship with Columbina, with a yandere Dottore on the side.

Because that's his little sister!

He is happy to be uncle anyways 😅

Yep, Columbina is thinking about lunar demigods babies, after accompany Sandrone to a check-up with Dottore for her mechanical parts and she mentions not having uterine injuries and being able to carrying children

Columbina was all serene outside, inside? Her mind is SPIRALING 😅

Why do I see Dottore catching onto Columbina's thoughts. The doctor just squints at her when Sandrone!MC is looking away.

Like calm down you feral Goddess. Wait till after you marry his little sister, you horny beast-

I have more ideas for that AU (I love the idea of her being in a relationship with Columbina, and having a platonic bond with Dottore—he’s a better big brother to Sandrone than Jason, Dick, Steph, or Cass... actually, he’s a better sibling than any of the Bats, except for Barbara):

Guillotin took Sandrone in because she reminded him of his sister; seeing her aptitude for machines, he made her his protégé, though their bond eventually grew into a father-daughter relationship (Guillotin was undoubtedly a better father than Bruce).

- "Marionette" was the reader's alias as an inventor; she later adopted it as her actual name.

- After Guillotin's death, Marionette inherited his home and assets; although she adopted the surname "Guillotin," she prefers to go by Marionette or Sandrone.

- The parts of Sandrone!MC that were replaced with mechanical components after Alain saved her life following that accident are: both arms; the right leg from the knee down; the entire left leg; her eyes (which were damaged); and parts of her heart (luckily, she has no resulting heart conditions).

- Although she suffers from chronic back pain, she has no spinal cord or uterine injuries, meaning she can conceive (a chance for lunar demigod babies? Maybe? 😏).

- I picture the Tsaritsa as being very protective and maternal toward her Harbingers; upon hearing what the Waynes did to Sandrone/MC... if they ever set foot in Snezhnaya, she’d plan to freeze them solid.

Ooohhh! More of this au! I love all of it! 🥰

Oh, and the part about demigod babies, oh dea, oh my, has Columbina already got the idea in her head? Has she told Sandrone!MC her thoughts? 🤭

She always loved him and unknown to him (because she changed and such), she was the person who saved him from his village burning down, the one who encouraged him to seek answers and not be afraid about showing his intelligence. She loves him and knows she should not have feelings for him because of all that he did, but she loves him

Then she joined the Fatui but she never showed her true strenghh the or smarts so she was put in rank seven. Dottore joined a few years later.

Her and Columbina are like sisters and Columbina is feral over her. But then it happens and Sandrone!MCis stabbed through by Dottore. She smiles despite it all. Her soul lingers and watches forever protecting Columbina until she can gain a body back

This... screams a LOT of angst. Like tragic angst...

Oh, and more stabs to the heart if a feral Columbina accidently reveals Sandrone!MC crush on Dottore mid fight due to rage, causing the Doctor to be like, "...Wha-".

And then sometime afterwards after he picks his wounds he sneaks over to Fontaine to find the Marionette to confront her... only to find out due to his stabbing and 'killing' of her, when she was repaired... the Fontaine Research Institute wasn't able to save her memories... so she had no memories of Dottore.

What if...Sandrone! MC is already pregnant with Columbina's first child when the batfamily learns where she is (or after seeing the Fatui harbingers records)

(Alfred and Barbara just received Sandrone MC letter telling them about her pregnancy a few days ago before the Justice League mission where the bats see the records about the harbingers)

Anyways everyone in Sneznhaya is extra protective with her (especially her wife Columbina, her big brother Dottore and her "mother" Anastasya) and they won't be NOTHING happy when a strange portal opens up in teyvat

...Its the Justice League, isn't it? Or maybe just a fea of the bats? Either way... can they just leave? Leave and never come back?