Ohh, is Naska feeling heartache?? I thought he only thought of Sasha as like an annoying g...

Ohh, is Naska feeling heartache?? I thought he only thought of Sasha as like an annoying girl-next-door type or the nagging older sister type, I never thought he would grow some romantic feelings for her. Or maybe what he felt was like how when the attention of your best friend isn't on you anymore but her new boyfriend and you feel as if you've been abandoned ╮(￣▽￣)╭