The king of Tomorrow(Susan Pevensie X Male OC)

What if when the four pevensie siblings went to narnia they weren't the only ones
Jake Archer is a 15 year old boy from the north of England
He was born in the year 2004 but one day goes to the house that belonged to his great grandfather before he had to downsize to a cottage
What mystery's will he find when he enters a wardrobe and goes into a land
A familiar land that he has been to before
The land of narnia

Characters are all ages up by three years so Peter is 16 Susan is 15 Edmund is 13 and Lucy is 11