Texting You (not continuing any further)

Harry is a regular school boy in high school. He doesn't talk to anyone, doesn't have any friends, he has no one. He sits by himself and draws in his text books. He always listens to music. He always reads in the library at break time. During his recess break, he finds a number written on the shelves from another person, he wrote it down in his book and erased the number off the shelf. When he gets to his apartment, Harry inputs the number in his contacts and thats the only number on there. No one knows his got the number and this person doesn't either. But what happens when he sends a text? He doesn't know the gender of this person and neither does the stranger. What happens when they keep texting each other?