Lets just believe that:
Every day after the day Homura kissed Madoka's fingers under the rain, Madoka visited the library, hoping to get even just a glimpse of the girl again.
When almost all hope was lost, one day Homura finally came back. It was raining outside. Her hair was dripping wet from the rain. Homura was panting. She came there running.
Madoka stood up as soon as she saw the girl. Her worried eyes roamed Homura and she gasped when she saw the dirt and the lacerations on the girl's clothes. There were blackened traces of dried blood that smeared on her uniform.
Homura's expressive purples eyes were filled with apprehension. It widened when their eyes finally met, as if she couldn't believe she'd actually find Madoka there, waiting for her.
"Homura-chan?" Madoka said, still not making sense of what she's looking at.
Homura's really here.
She came back to her.
Homura exhaled, suddenly looking relieved, then she broke into a smile, her eyes glassy with happy tears.
"Hello, Madoka. Sorry if I kept you waiting."