Nico Di Angelo X Supergirl (Kara Danvers).
Supergirl gets caught by Tartarus, how he got ahold of kryptonite she'll never know, but when she gets forced to hold the sky even she cant take this weight especially with the kryptonite 5 feet from her, far enough away from her to not kill her, with some so called general mocking her and expecting someone, whoever that person is she hopes they don't take long because she can't take this much longer.
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Nico was having a decent day, Four years after The Second Giant War, Nico is busy doing tasks for his father and helping Hades with some paperwork. Nicos powers have become more powerful, too powerful. When he tries to fight using his powers, his powers try to claim him as a shadow and if he gets hurt it's almost impossible to save him from the shadows absorbing him.
Nico gets summoned to Olympus, when he gets there he sees the gods talking to an amazon who introduces herself as Diana (Wonder Woman). He finds out that Diana is requesting one of the "Heroes of Olympus" to save a good friend/colleague of hers named Kara Zor-El (supergirl). That leads to the gods giving Nico a quest to save super girl and try to figure out how Tartarus was able to manifest a body outside of his pit.
Nico, wanting to prove himself, accepts.
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How will Kara react to her "knight in shining armor" being a sickly and malnourished looking 18 year old boy? Or better yet, after he saves her; How will she save her knight when he starts fading right before her eyes...