A/N: In this story, I did not name the main character so she is referred to as she or her. Also I do not own Harry Potter, only the plot idea in this story, not the wizarding world or anything you recognize as J. K. Rowling.
In this story Snape has a younger sister that was born the same year as Harry. But when their parents die, Snape gets landed with her. When she was younger, she always tried to play with him but he wouldn't do those things (such as play dress up). He was very upset at getting stuck with her as a burden but does learn to love and acomodate her. When she starts growing up, she is starved of T.L.C. She knows that he loves her but he never said it.
When she gets to Hogwarts, and gets sorted into Griffindor, it gets worse. She starts to think that he resents her. She notices that the other kids parents don't treat them like Snape treats her. That he treats her just like any student. Not just at school, but also at home. And that he always has. She becomes friends with the golden trio in third year when she runs out during the full moon after Snape scolded her for getting only an A on her potion. After the run in with lupin, she and the trio becomes friends and she helps Sirius escape. She starts spending more time with them. However, the three were always closer with themselves than they were with her. They were her only friends, but she wasn't in the super tightly knit group.
In fourth years, she starts to fall for Harry who doesn't return his affections. He likes Cho Chang. She was very sad when she wasn't asked to the dance at all. They remembered Hermione and Ginny were girls but not her. It hurt her that he went with Patil instead of her.
In fifth year, She gets in big trouble with her brother for going to the department of mysteries. She didn't know that he was just scared and worried for her because he yells at her and calls her stupid. After this, she starts to get depressing thoughts. In sixth years, she knows he is hiding something from her. She is very hurt when Harry decides to take Luna to Slughorn's Christmas dance instead of her. When Harry hits Draco with sectumsempra, Snape yells at Harry but in private, yells at her. He says that she must have given Harry that spell or book. That she must have snooped through all his stuff. This greatly upsets her. She is at the breaking point. This is when she either attempts suicide, runs away, starts cutting or something like that. Maybe she pours herself into books, so that she can try to meet his standards. Lacks sleep and food because of it. Eventually people notice.
When Harry kisses Ginny in the common room, she runs out, trying not to make a spectacle. Harry goes after her it goes a little something like this.
"Hey," he says sitting down next to me.
"Hey," I reply wiping my tears away. "Sorry." I appologise.
"It's okay," He says, "You know, Hermione did a similar thing a few months back when she caught Ron kissing Lavander. So, who is the prat that did this to you?"
"I don't want to talk about it." I say very akwardly because he just called himself a prat. "It's not just that, there are so many things going on right now. Not just in school, but at home too."
"Tell me," he encourages. "I am the person out of anyone who would understand."
"It's nothing new, just Severus being Severus. I don't think he knows how to treat kids other than like a student. I am just one that lives with him, taking up space, food, and money."
"Tell me about it. My aunt and uncle hate me. It is no picnic for me either. I just wish that my mum and dad hadn't died, that would have made life so much better." He says, trying to relate.
"Except for me, this is the better life Harry," I say solemnly. "Maybe I wasn't meant to be happy."
"Don't say that. You-"
"You're parents loved you, Harry. My dad killed himself drunk driving. Do you know why he was drunk driving? He was an abusive alcoholic, he drank all the time. But this time it was special. He went out to get some extra strong stuff to get drunk because he had learned my mum was pregnant with me. And then he died. Because he hated the idea of me. You would think that that was good thing because he was so abusive but my mum somehow loved him and this made my mum feel into depression, nearly miscarried me several times. After my birth, she had a slight problem that the doctors just need to fix. The issue wasn't uncommon and everyone survives it because it is easily fixable. The doctors just needed her permission. But she wouldn't give it. She wanted to die. Even though she just had me, she still died, on purpose.
"Severus didn't want me either. I know that he begged Dumbledore to take me and give me away but Dumbledore didn't let him. So he was stuck with me. No one wants to be with me."
"Wow," Harry says shocked. "I had no idea." There was an awkward pause. That isn't what I wanted him to say. I needed something comforting. I just spilled my deepest secrets to him and all he has to say is "Wow". He didn't even deny that no one wanted my company. He didn't even say that he enjoyed it.
"Umm... well... I'm sorry. Anyways, I hope you feel better. That stupid, clueless git isn't worth it anyways. Well, I should probably get back to Ginny. Someday, I know that someone will love you. And that that someone will love you just as much as I love Ginny." He says trying to be comforting but I could see just how uncomfortable he was and how desperate he was to leave, even in my time of need. I guess we weren't as good of friends as I thought we were. Did he even consider me his friend?
I nod and stand up. We head back to the common room but instead of staying for the party like him, I head straight to my dorm. His words repeat in my head. "Someday, I know that someone will love you." I know he meant that to be comforting but him basically admitting that no one loves me, not even him, hurts. I'm sure he meant romantically, but still.
She starts to ignore the trio, not to be mean, but because she is hurt. She starts to feel very lonely. They leave off on the wrong foot. She stays at the castle instead of taking the train like the others because her brother doesn't leave for another few days. On the train, Harry explains the conversation that he had with her to Hermione and Ron where Hermione tells him how he hurt her with his words and explains how the guy she liked was most likely him. This makes him feel terrible but he doesn't see her because he goes off Horcrux hunting.
In seventh year, Draco Malfoy starts to comfort her, as he know what it is like to be a young death eater, and while she isn't one, she is afraid that she will have to become one. She starts to get better with her sleeping and eating patterns. She becomes close with him. She eventually falls in love with him. After the trio escaped Malfoy Manor, Draco tells her what happened. They end up sleeping with each other. A month later she finds out that she is pregnant. She tells Draco, they decide to keep it a secret except that they are going to tell Severus.
When she goes to the headmasters office, she overhears him talking with Dumbledore's portrait. They are talking about how Snape is worried that Voldemort will come after him because he killed Dumbledore and is supposedly the owner of the elder wand. Dumbledore reminds him of the sacrifices that he must make for the greater good and why he was doing this in the first place, protecting harry, taking her in. For Lily. This greatly hurts her because she thought that he eventually he loved her, and wasn't just doing this for a dead love.
She bursts in and confronts him, yells at him for not loving her. How she couldn't believe that he was going to just let himself die when she needed him most. Screaming that she hates him, she tries to storm out but Snape locked the door and took her to his rooms. He explained that he didn't know that she felt that way. He admits that he wasn't to keen on the idea of raising a child at first but he would never go back on it. And that it wasn't just for Lily. It was for her too. He apologizes for the way he seemingly ignored her. When she was younger, he did it because Lily had just died and he basically blocked out the world. And that he was so strict because it is all that he knows. He would do it over if he could. That he never meant to treat her like 'just' another student.
She brings up school and Gryffindor. He says that he disappointed that she didn't get into Slytherin but not disappointed in her. He didn't want to give her any special privileges. That he was sorry for yelling at her for her potions grade. He had just hoped that she would follow in his footsteps and they could bond over that. He apologizes for yelling after the department of mysteries but that he was terrified that she went and horrified at the idea that something could have happened to her. And that in sixth year, he was in a panic in the bathroom, that someone had gotten their hands on the dangerous book with dark magic. That only a precise few knew about it and he didn't know how else Potter could have gotten it. He apologizes profusely for letting her think that he didn't love her or care for her for even a second.
She says that she doesn't really hate him and that it was a heat of the moment thing. She asks him to try to live, that she needed him to be there for her, especially now. He says that he will fight to live, and not just give up. However he is curious about the rumor of her and Draco which she confirms. She says that she loved Harry for years and was crushed when he left but that Draco was there to comfort her and pick up the pieces. That she loved Draco now.
He makes a joke about Potters never noticing Snapes. An awkward silence followed. Severus finally asks what she came to the headmasters office for. She freezes and shifts awkwardly. She stutters as she tries to find a way to put the words. Eventually she just comes out and says it. She's pregnant.
Snape freezes and asks if she is joking, which she is not. In his shock, he doesn't say anything for a while. She takes this silence as a very bad thing and starts to cry due to her hormones. She apologizes about ruining their relationship after it had just gotten better and how he probably hated her now. He instantly denies this and explains that he is just shocked. He assumes that the baby is Draco's which she confirms and asks her about her plans for the baby. She says that she will graduate before her second trimester so she won't have to worry about school and money because Draco's family is all set. She says that they want to keep the baby. Severus accepts this, promising to be there for her and after a few more words, they part ways.
At the battle of Hogwarts, Draco and Severus beg for her to leave and think of the baby but she refuses. They make a deal that she will stay in his office. Before they leave, she makes sure that they have their wand and insist that they also take bandages and dittany because of her motherly instincts kicking in. A few hours later, Draco comes rushing in telling her to go to the hospital wing. They run there to see Severus dying. Madam Pomfrey working busily. She says that he was bitten constantly by a venomous snake, most likely nagini, and that he would have died if not for the dittany and bandages. Ron and Hermione come rushing in with a bezor. Madam Pomfrey adds it to a potion that she has, shakes it, and feeds it to Severus. This saves his life. The wars goes on as normal. In the end, Harry and the trio come to find her with Draco and Severus. He takes her aside and apologizes for hurting her, saying that Hermione explained it to him. She says that she has moved on and explains about her relationship with Draco. He is wary at first but excepts it.
Life continues on, she and Draco get married, and have the babies. The boy came out first perfectly healthy. The girl came out second but they notice that she looks very small. Smaller than normal for twins. Most twins come out early like they did, but she looks almost too small and blue.
She is taken to NICU because she had the umbilical cord wrapped around her neck. She makes it and the doctor explains that is was a close call but that she is breathing okay and will have severe breathing issues that would be similar to asthma and not to let her eat thing that are too spicy, be near dust, exercise so intensely. They went over the routine for emergencies in case of an asthma attack and how to prevent one. They also explained that the baby's brother got more of the nutrition in the womb so she is a little underdeveloped and going to be small. They get to leave after a few weeks and live out their lives.