the end of a story (Is that natural and how to imorove it? It is for my homework~)

At dusk, when Annie has to say farewell with to Gabe, he holds her hands tightly. Annie realizes that Gabe has regarded her as his friend and doesn't want her to leave.
“Hey, Gabe. I have to go back to school and I will be here next Sunday, I promise.” Annie crouches down and holds Gabe’s hand, looking directly at in his eyes.
Hearing the this promise, Gabe is rejoices, humming to himself.
“Thank you for coming, Gabe. and I have had a good time.” Gabe’s mother hugs Annie before she leaves.
“I enjoyed myself a lot staying with you and I will be here next week at the same time,” says Annie.
After their farewell, Annie leaves Gabe’s home and walks in to the street, silently.
The whole week, rain retires there is no rain and the clouds part, admitting emitting into the sky a God-like light that lights up the heavens and What's more, a rainbow describes an arc in arcs across the sky.
Annie stops walking and stretches herself. Some classic lines in from Mary and Max flash in her mind:“ You are imperfect, and so am I. All humans are imperfect, even the man outside my apartment who litters.”
Annie stares at the rainbow and stretches her hand, intending to touch it. “God closes one door while opening another window for you,” she says to the sky. After a few seconds, she moves towards the station, humming “It doesn’t matter what color /or where abouts you are / This world that we have is for everyone...”

I hope this helps =]