Why does Aerara agree to a contract marriage with Lucian?

To save him from early mating heat and fund her laboratory.

Who is Luna and how is she connected to the main characters?

Luna is Lucian's daughter, later proven to be Aerara's biological child.

The Dragon King's Contract Witch

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The Dragon King's Contract Witch — A scientist contracts marriage with a dragon clan leader to save his life and fund her research, unaware a rescued girl is their daughter.

Aerara Wayne once spent a single night with Lucian, leader of the Dragon Clan, and was told their daughter died at birth. Five years later she rescues Luna, a girl escaping kidnappers, who proves to be Lucian's child. Luna pushes them toward marriage, and Aerara agrees to a contract union to stabilize Lucian's early mating heat and secure funding for her laboratory. Meanwhile, Aerara's rival Lydia orchestrates poisonings and assassination attempts that are uncovered and thwarted. A paternity test ultimately confirms Luna is Aerara's biological daughter, uniting the three as a family.

Quick answers

Why does Aerara agree to a contract marriage with Lucian?: To save him from early mating heat and fund her laboratory.
Who is Luna and how is she connected to the main characters?: Luna is Lucian's daughter, later proven to be Aerara's biological child.