There weren't many of the opposite sex who had intimate gestures with Annan.
Apart from Maria, his biological sister, there were only three others: Kafney, Lin Yiyi, and Jiu'er.
Lin Yiyi was the easiest to understand—she didn't actually like Annan himself, but just liked cute things.
She was a simple aesthete.
She liked holding Annan just as much as she liked holding Kafney. She even liked Jiu'er, as well as Defu and chocolate... If she could see Husky and Selicia, even knowing their true male nature, she would probably still find them adorable and be charmed by them.
You could say she was a classic case of LSP.
She would boldly provide Annan with comforts—like shampooing his hair or letting him rest his head on her lap. Essentially, it was she who was taking advantage of Annan. It was the same when she hugged Jiu'er before logging off each day.
Lin Yiyi was very aware that, as a beautiful girl, she was afforded certain social privileges.