Harry met Holly when she was two - abandoned in the park by her mother. Unable to leave her alone, he stayed behind to keep her safe. Over the years, they became as inseparable as brother and sister.
When Harry found out he was a wizard, he was happy to find that Holly was a witch too, and one day, she would enter his new world with him.

Finding out he was a father to a nine-year-old girl, Severus Snape didn't hesitate to bring her home. His daughter belonged by his side, after all. Finding his daughter preferred Harry Potter over him was a travesty the Potions Master was not going to tolerate.

Somehow, Severus had to make his daughter see Harry Potter as he did - worthless, useless, hopeless.

Takes Place: 5th summer, 5th Year - Snape flavour: Snape is Angry, Snape's a Bully, Snape Comforts, Snape is Controlling, Snape is Kind, Snape is Mean, Snape is Stern
Tags: Abuse Recovery, Alternate Universe
Categories: Teacher Snape > Trusted Mentor Snape, Teacher Snape > Professor Snape, Snape Equal Status to Harry > Comrades Snape and Harry

Responding to JAWorley's Just Pretending Challenge:
Severus is in big trouble. He doesn't have any kids, but he's supposed to be bringing his son to Christmas to meet his family, who he's been estranged from for twelve or thirteen (or more) years. Harry ends up being that pretend son.

Takes Place: 3rd Year - Snape flavour: Snape is Angry, Canon Snape, Out of Character Snape, Snape is Secretive, Snape is Stern
Tags: Abuse Recovery
Categories: Teacher Snape > Professor Snape

COMPLETE. Harry and Hermione go to a prestigious summer school, where Snape is a teacher. Unfortunately for Harry, Snape has spoken to the other staff and is on his way to turning the whole school against Harry.

Takes Place: 6th summer - Snape flavour: Snape is Angry, Snape's a Bully, Canon Snape, Snape is Cruel, Snape is Kind, Snape is Loving, Snape is Mean, Snape is Stern
Tags: Adoption, Hospitalization, Injured!Harry
Categories: Healer Snape, Teacher Snape > Trusted Mentor Snape, Teacher Snape > Professor Snape, Parental Snape > Guardian Snape

Severus Snape comes across a runaway… the boy-who-lived to be exact, and drags him back to his home where a struggling Harry is surprised to find Luna Lovegood. Severus had agreed to take custody of Luna at the start of the summer, but taking on the boy who lived to be a pain in his arse as well? Harry is finding out quickly that he’s got everything to lose… and everything to gain. In response to the 'multiple challenges', 'this is home', and 'father to two challenges'.

Takes Place: 6th summer - Snape flavour: Snape is Angry, Canon Snape, Snape Comforts, Snape is Kind, Snape is Loving, Snape is Mean, Snape is Stern
Tags: Adoption, Incognito!Harry, Injured!Harry, Runaway, Sibling Addition
Categories: Healer Snape, Teacher Snape > Professor Snape, Parental Snape > Guardian Snape