Levi: If Levi wanted your attention he would try to get you to do an activity with him. If that doesn't work then he would stop you from whatever you are doing at the moment and make you talk to him.
Rin Okumura: If this sweetie wanted your attention I'm sure he would just hug attack you from behind. Pull you into bed and cuddle you until you were practically throwing him off you. (Had a picture of him but it is not loading sorry!)
Ayato Sakamaki: This redhead is possessive, so if he wants you he's going to get you. No matter that your doing he will drag you away into his arms. If you refuse you'll be left with some love bites all over you!
Sasuke Uchiha: Sasuke would be blunt with you and say he wants to spend some time with you. If you are busy he'll wait until you done with whatever your doing but don't take to long or else make you stop and pay attention to him.
Ken Kaneki: He would cling to you making it impossible to do stuff. Eventually you will have to give in and give him attention. If you choose to ignore him then he'll just simply squeeze you tighter until you give in.
Katsuki Bakugou: Bakugou would try and hide the fact that he wants you. He'll slowly start to touch you more and more and be really clingy. If you were doing something he will tell you he needs something from you and pull you in on his lap and never let you go.
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Anime Boyfriend One-Shots and Scenarios (mainly Yandere)
FanfictionThis is a one--shot book full of your favorite anime characters portrayed as Yandere's and more!