Born from a werewolf and a vampire and destined to bring down the Dark Lord once again, only the twins have different plans in store for the wizarding world with aid from their mother, I don't own Harry Potter, first HP fic in a long time, please be nice, likely to contain twincest and attempted harem Hybrid!Harry, Grey, possibly Dark!Harry, don't like don't read.

Bewteen H4/H5: After a year of leave, John is now stationed aboard the UNSC Infinity. Someone is captured trying to infiltrate the ship, a human female whose looks and wits are the same of Cortana's. She's not the only one who escaped Death, and the Universe is now a far more dangerous place to live in. "You know it's me, Chief... don't you?" MCxC Human!Cortana vs Rampant!Cortana

8 months after New Phoenix the Chief and Blue Team find themselves on an ONI research station. After a mysterious encounter the Chief decides to abandon his post to find Cortana. Strange Slip Space events are occurring, and John begins remembering things he's never experienced. How does he face these new challenges and how will his actions affect the galaxy? Potential Halo 5 plot