Y/n Stark is Tony’s twin sister. Not long ago, she started drinking a lot. She rarely sleeps. Instead, spending all of her time in her lab. She’s never really had a boyfriend before, and she’s so oblivious to love that she doesn’t even realize that someone living under the same roof as her, is completely in love with her. That someone is Bucky. And even though he’s trying to hide it, it’s pretty obvious. Well, to anyone but Y/n.