After defeating Voldemort, Harry helps Hermione find her parents in Australia. There were consequences to sending them away, and without jobs or a house, the Grangers are living with him. Harry/Hermione's Mum pairing.
Trope has been done to death, but here is another Ministry Breeding Program fic with Harry/Narcissa as the pairing. Narcissa has been in jail since the end of the war. While serving her sentence, she is given the opportunity to sign up for the Wizarding Re-Population Act and trade her cell for a wizard's bed.
Now in college after No Way Home, Peter comes home after a party to May who survived the Green Goblin's attack. She is the only one who remember who Peter Parker is! MCU HOT AUNT MAY LEMON/SMUT
The Summer after the Battle of Hogwarts, with Harry and Hermione both living at 12 Grimmauld Place a complete accident puts the two friends in an unlikely position! SMUT / LEMON, PLOT?/WHAT'S THAT?