Disclaimer: Unfortunatly I don't own Harry Potter characteres. I do, however, own some of the later characters. I don't want to give it away by saying who, but I'll add that when I get to it.
Here is what I think happends to Neville Longbottom and Hannah Abbott after the Battle of Hogwarts.
Hannah Abbott couldn't stop thinking about the Battle of Hogwarts. She was going to leave with the younger kids; but since she was part of the DA, she thought it was her duty to help Harry. She ended up helping to block the entrances for as long as possible, from the oncoming death eaters. She kept the death eaters at bay for quite a long time, but they eventually took over and fought their way in. She was then fighting one death eater for quite a while. While going to help fight in the Great Hall, she (along with Seamus Finnegan) had been saved by Harry. She needed to remember to thank him for that. The thing that she couldn't stop thinking about the most, though, was the final battle between Harry and Voldemort. (Voldemort isn't a threat anymore, so people freely say his name. Some older people are still a little wary of saying it, though.) It was so weird; one minute Voldemort was there, and the next, he wasn't. She remembered feeling really scared about it, and then her fears vanished with him.
After Voldemort was destroyed, the teachers and other adults moved the bodies somewhere (nobody but them ever knew where) and made tables and chairs appear so that everybody could take rest. Hannah was sitting alone at the table that was usually the Hufflepuff table. She was sitting alone to think about what just happened, and her friends were all either dead or talking to each other at the other end of the table. Neville had told Harry that he wanted to tell Luna that he's crazy for her. He ended up finding her at the end of the battle in the Great Hall. He told her that he loved her, but she turned him down and said that she didn't want a family yet. She was still looking for a crumple-horned snorkack. Neville was crushed. He was so sad that he just sat down at the first table he came to. That table ended up being the one that Hannah was sitting at. Hannah and Neville knew each other from Herbology, but never really talked to each other besides that. They both liked each other, but they didn't know that the other liked them. Neville could tell that Hannah was thinking about something, so he didn't talk to her. Hannah could tell that Neville (no matter how hard he seemed on the outside) looked like he was about to cry; so Hannah got the courage to ask him. "H-hey, Neville. Is everything alright?" Hannah asked. Neville sniffed. "Not really," he admitted. "Tell me," Hannah said, "I won't tell anybody, if you don't want me to." Neville sniffed again. Shakily he started to tell her. "The first time I really realized how beautiful she was, was in our fifth year. We ended up riding in the carriages together. I remember thinking that her voice was so dreamy." "Excuse me," Hannah interrupted, "I don't want to be rude, but who are we talking about, exactly?" "Why Luna Lovegood of course." "Oh. Sorry, I'll let you continue now." "Thanks. She and I grew pretty close in our fifth year. Especially since we were both in the DA. We kind of drifted away a little during last year, but came back together this year. We were both in the small team that kept up the DA things. We both felt that being true to Harry was the way to go, and it was terrible if you went over to the side of Voldemort. I always thought that it was kind of weird, the way she did things, but I got over it." "So why are you so sad, Neville?" "I was madly in love with her, so I went over to tell her, but when I did, she said that she didn't want a family yet. She turned me down!" "I-I'm sorry to hear that, Neville. I-I don't know how to say this, but... I think I'm falling in love we you." "What, no way." "I know it sounds silly." Hannah interrupted him. "N-No! It's not." "It's not? Why?" "Because I kind of fell in love with you, too. I was crazy for Luna, but I love you, too. But, why me?" Hannah explained, "Ever since you started helping me with my Herbology homework in our third year, I realized how smart you really were. Forgive me, Neville, but for some years I thought that you were weird. I thought that you weren't very smart. At the time, you never really said or did anything worthy of loving you. Like I said, sorry." Neville stared at her. He couldn't believe what he just heard. He then told her his part of the story, "I really wasn't the one to decide to help you. Prof. Sprout told me that you were struggling, and suggested that I help you with your homework. When I started helping you, I thought that you were very pretty. I love you, too." He then asked her if sometime in the future, she would marry him. She said yes, and they became boyfriend and girlfriend.
Please R&R, even if you think it's bad. It's my first fanfiction, so if you have any comments, please tell me!