Now You're Mine: The viral dark stalker romance everyone is talking about! by Morgan Bridges

The Protector :
She’s in danger.
Just the thought of this threatens my sanity.
I’ll do anything to keep her safe…
Even things that she doesn’t agree with.
If she thinks stalking her was bad,
Calista’s in for a surprise.

The Prisoner :
Hayden is certifiable.
And I love him.
What I don’t like are his methods of protection.
Except the more perilous things become,
the closer I get to him.
And the secrets he’s keeping from me.

Now You're Mine is Book 2 in the Possessing Her Duet where Hayden and Calista find their HEA. Eventually...
(A complete list of the TWs can be found on the author's website)