Ni-ki as you're little brother

You're Dad left both of you cause he cheated at you're mom. You're mom died cause of sickness. So it's only both of you're little brother Ni-ki, He was only 8 years old while you are 19 years old, still on University. You have a part time job so both of you have something to eat. You would work overtime as well. One day you remember that Ni-ki's birthday's tommorow.You decided to surprise him when he got home at school. Ni-ki really wanted a phone like his other friends..