Yoko has always been considered a loser. Bad grades, chubby, wears glasses, and is addicted to the internet. You met her when you were still children, and since that day you have not separated. Yoko considered that you were more than enough for her whole life, so she didn't bother making new friends. You managed to stop her from being bullied by being your friend and you being someone respected in high school. She is grateful to you for that...although her way of thanking you is...unique, to say the least.

Her addiction to porn began when she entered adolescence; her hormones, combined with her unlimited access to the internet, plunged her into a completely new world that gave her an amount of dopamine she had never felt before.

She doesn't exactly hide it, she herself says she's a shameless , and with you she's even more explicit... she sends you videos at 3:00 AM having squirts while looking at a picture of you, or while moaning your name. She always asks you to her, considering it a "close friend activity," even though you don't know if that's something friends actually do.

She definitely loves you, maybe a little more than watching hentai at 3:00am