Emi was there to help her in the morning, but she left afterward. That's beside the point though, since we saw that Rin probably could dress herself if need be in the atelier. It would just take a little longer I imagine. I don't get the feeling Rin takes pride in anything really though.
Asking him to help her with her clothes was just a little white lie, an excuse to get him in position to make a move on her or vice-versa. Like when a girl in school would casually mention that her parents weren't home that afternoon, and you should come over to help her study. Just a bit more direct, I suppose. She had to initiate things with him because he was too much of a nice (or scared) guy to initiate anything, and she knew that even though he would want to do more, he would dry her off properly and dress her again if she didn't push him a little.
She doesn't want to love him, because she's afraid that loving someone, being that close to someone, will change her. She's afraid of change, of maybe losing her freedom perhaps, but she's also desperately lonely, and hurting, and she does love him. Maybe he can never truly understand her, maybe nobody ever can, but he has been closer to her than anyone ever has before. She went wandering in the rain probably just to walk around and think. She did say she thought she needed to change while they were going back to the dorms the previous night, and while walking around she probably decided she would go to him and change their relationship right then, before she changed her mind. Maybe she also worried that he would drift away, or that she would miss the chance and lose him if he left for vacation, but maybe she never thought about that at all.
...
Well that is a little rambley and imperfect, but it was hard to write because I ended up going back and doing the Rin route again to check stuff. Of course that meant getting sucked into it all over again. Now I need a drink. Or maybe some chocolate ice cream. Or both
