Percival finds Credence when he's much younger, he senses Credence's repressed magic and sees the physical abuse on him. Percival takes the boy in and adopts him, raising him and guiding him in the wizarding world. Percival is protective of his son and so tags along when Credence heads to England to attend an alpha/omega matching ceremony.

Newt is a omega that hits off with Credence, liking the quiet alpha. Percival immediately tries to learn everything he can about him, wondering if Newt is too old for his son. Along the way he and Newt fall for each other.

+Credence sees it before them
++He subtly encourages it
++Credence meets a omega and fall in love too, happy ending all around