I've Never Seen You Fall So Hard.(MPREG)

Harry and Niall have been together for years. They've been married for three.
Niall can't get pregnant.
Which is fine.. Right? That's always what he tells Niall. "I don't really want kids anyway."
Bullshit.
He's wanted kids for so long.
So when he meets the beautiful Louis Tomlinson.. He can't help himself.
What was meant to be a fuck and go, turned into a bit more.
Things get more serious. And yet, Harry's still married to Niall, but spending so much of his money on little Louis.
Since he's practically a sugar daddy, for Lou.
(But minus calling him daddy, because yeah.. Not quite my thing with writing.
)
But. So here he has a pregnant Louis, in this huge house. And back at home, a waiting husband. He probably fucks Louis .. Way more than he does Niall. But that's okay.
He doesn't choose to just leave Niall for now.
Is he really only using Lou to have a baby?
Or does he really adore him, like he states?

(you've been warned this certainly has Mpreg.)