The Temptation of Adam by Dave Connis

Adam Hawthorne is fine.

Yeah, his mother left, his older sister went with her, and his dad would rather read Nicholas Sparks novels than talk to him. And yeah, he spends his nights watching self-curated porn video playlists.

But Adam is fine.

When a family friend discovers Adam’s porn addiction, he’s forced to join an addiction support group: the self-proclaimed Knights of Vice. He goes because he has to, but the honesty of the Knights starts to slip past his defenses. Combine that with his sister’s out-of-the-blue return and the attention of a girl he meets in an AA meeting, and all the work Adam has put into being fine begins to unravel.

Now Adam has to face the causes and effects of his addiction, before he loses his new friends, his prodigal sister, and his almost semi-sort-of girlfriend.