How to get this boy to like my bff?!?! ( help!!! )?

Hi, my bff has like a huge crush on this boy..actually more than a crush. They are the same age but in different level. Eg. She is like suppose to be grade 6 but instead in grade 3. Like that. They meet once a week. He does not have a gf. He 'kinda' likes her? They meet a lot in the train and bus and during recess but do not talk cuz they don't know each other! He is going to be here for 1 year only!! So please help!!! Pretty please!!!!!