He Is Not My Son

This story is being posted on AO3 because my previous works were removed from Wattpad.

Alan, a wealthy lawyer raising his son alone after being abandoned, believes he has found a kindred spirit in his new neighbor, Jeff. Observing Jeff's total devotion to little Charlie, Alan assumes he is a young, struggling single father, just like himself.
What Alan doesn't know is that Charlie is not Jeff's son, but his brother, and that Jeff is only fulfilling a "custody contract" to survive and take care of his little brother. As Alan tries to "guide" and protect the supposed young father, an unexpected attraction begins to grow between them.