I wonder how the loli will fall specifically for her considering all her clients.
You don't get it? It's because Kaede is so helpless and hopeless and all around pathetic that Rin-chan will feel in her heart the irresistible drive to protect her and take care of her. That's how it always works!
It's a classic trope in the oneeloli genre. JS-san to OL-chan, Be Careful Onee-san, Mai-chan no Onee-san Shiiku Gohan and many more all come to mind.