You literally could be sitting at a library or outside a coffee shop and man here would fall head over heels in love with you. Faster than you can say 'Avengers Assemble'. He'd think you're some kind of god or goddess and he needs to know MORE about you, but he's kinda shy to strike up a conversation with you and he's afraid he'll mess up the first impression
Would most probably stalk you for like 3-4 months to get to know your schedule more and find out more about you or as he prefers to call it 'Learning more about you'. He'll find out everything about you from your favorite food to your favorite movie and book series. It might take him a while to approach you and start a conversation with you since he wants to get everything right and doesn't want to mess up
He'd actually be open to sharing you with Steve since you know... both of them are best pals
As a yandere he is VERY protective and obsessive of you, especially concerned about his darling's safety. He tosses and loses sleep at the thought of someone harming you. Are you all right? You're not hurt right? Man here will literally FLIP if something happens to you
He hopes against hope that you haven't found out about his past but if you did, he'll take his time to convince you he won't hurt you or do anything to you. And besides, you won't be able to find out much about his past anyways since he must have erased most of it from things like papers and stuff like that. Bucky really loves you for treating him like everyone else and not some dangerous monster and he admires you for it too
He will stop at NOTHING to win you over. Even if it means getting rid of rivals and enemies. Well, he won't directly resolve to violence at first when it comes to rivals, he'll warn them 3 times or something like that. And if they still don't listen... well... oh look, there's a dead body found! And he'll destroy any evidence that leads to him killing that person since he does have the required skills after all. They don't deserve to even BREATHE the same air as you according to him and YES, even if he has to get the Avengers to help him he most certainly will
He's kinda like a lost puppy always wanting to be around you
He won't kidnap you off the bat just yet but if he thinks you're in danger kiss your freedom goodbye. But don't worry, he'll treat you well and have all your favorite things read y for you in some secret underground bunker or a cabin in the woods or something like that. he understands you'll be scared, confused and angry at him and he'll treat you like royalty, never making you do things you don't like doing and never yelling at you or even raising his hands at you. You'll most probably fall into Stockholm Syndrome within 2 months or so since he's SUCH a gentleman with you
He just CAN'T afford to get angry at you and so, if you try acting up or trying to escape, he'll just sigh, pull you onto his lap and have a nice long talk with you while cuddling you asking why you'd do something like that. He'd love to have a family with you and he'll never let you go. After all, all you need is HIM

BINABASA MO ANG
YANDERE AVENGERS ONESHOTS
FanfictionEver wondered what the Avengers or the characters of the Marvel Cinematic Universe would be as yanderes? You'll get to know only if you read 'em. Hope you enjoy and none of the art which I use here belongs to me, so credits to the respective artists...