Bill here is a very protective yandere. Well, that explains it since he did get bitten by Fenrir Greyback the werewolf and he doesn't want something bad happening to the ones he loves

He is big on cuddles and showing physical affection and intimacy with you. You might Bill if you work at Gringotts like he does as a curse breaker or if you've been friends with him when he went to Hogwarts. And we all know he's the human personification of the word 'Cool'

He attracts LOTS of attention from people but when he gets hooked on you... man he is determined to make you his. He will not leave you alone when he sees you. He doesn't become a yandere directly at first, his yandere feelings and feelings of overprotectiveness will develop slowly as time goes on and if he thinks you're in danger and don't take care of yourself very well

Lol he will do whatever he can to impress you. Oh, you just heard about that spell that some wizard did a few days ago and you found i impressive? Oh look Bill here can do it too. You have a fascination for talking about old and ancient things and Egyptian tombs? Well, look who can strike up a conversation and go hours and hours about the topic. Oh my Godric, this man here will literally talk with you for hours and hours about well... whatever you want to talk about. Like his job, your job, your life, his life and all that

He will most certainly introduce you to his family and of course, his family will take an instant liking to you immediately. They will do whatever they can to make sure Bill has you as his. And yes, that includes Molly and Ginny trying to set the both of you up and Charlie sometimes teasing you and Bill and trying to make Bill jealous by sitting really close to you during dinner and stuff and sort of drives him nuts. But Bill will just smirk and grab your hand and do something or the other that will end up getting an 'Aww....' from the rest of the family (Insert gagging sounds here from Ron, Fred and George) and you'll end up like a blushing tomato

He gets pretty jealous every now and then and when he does, it is literally time for you to run from him and get the hell away from him because when he does get jealous, long story short without beating around the bush, you won't be able to walk straight for the next one week that's for sure 👀😳😏

You'll have to assure him that you love him every time he gets insecure of his scars and he'll look at you with such love and gratefulness in his eyes, it's a really heart warming moment. You'll just lay there with him, cuddling with each other basking in each other's presence

He might actually try to make you leave your job whatever it might be. Don't take this the wrong way, he does believe that you can take care of yourself and you're more than capable of protecting yourself but he just doesn't think it's safe. And besides, why work at all when he can work and provide for you for the rest of your life?

If at all the day comes he kidnaps you or doesn't let you leave his house, he'll take all of your tantrums with a great stride and he'll be patient with you. He understands how you feel, but every poisonous word you throw at him does break his heart and he feels like someone is using the Cruciatus curse on him. But he won't snap at you, he'll just sigh and apologize to you saying that he really loves you and since he cares for you he can't let you go. It'll be hard for you NOT to fall in love with him on your own since he's such a sweetheart and gentleman to you, never forcing you to do anything that you don't want to and giving you space if you need it

He will not take it lightly if other people make the mistake of flirting with you. He'll tell them to stay away from you at first since you're taken by him and he'll give them a warning 3 times. If they still don't heed his warnings he'll have to hex them and then prepare for not being able to walk straight for a week and your pretty little neck being covered and littered with hickeys and love bites from him. What? It's his way of showing that you're his, how else will everybody know you belong solely to him and only him?

If at all you do tell him that you love him he'll be really happy but will also be kind of cocky about it and have you on his lap, tease you slightly about it before he kisses your lips softly and then your forehead, telling you how much he loves you too. Overall, this man is your ideal dream guy