2 stars
I read this just because of a challenge, otherwise I would never have chosen a taboo story to entertain myself.
My low rating of this book, though, it's not based on the taboo nor the dubcon tropes, because it wouldn't be fair to the author since they're well advertised and I wasn't blindsided by them.

My issues lie elsewhere.
First, Ben seems like a child, not a 22 years old: he stutters everytime he talks, he basically does nothing (it's said he's in college, but he actually never goes to class), he's just there for his uncle's pleasure.
Second, while Ben's attraction to his uncle is understandable (he's a young virgin gay man, eager to dicover sex), Devon's comes out of nowhere. There's no hint that he was feeling attraction toward his nephew; after Ben's telling about being rejected, he just drags him to a glory hole.
Third, the forbidden part of the story (them being related) is conveniently skipped when they are outside of the bedroom. It's briefly said that Ben's mom (Devon's sister) is suspicious, but we don't get to see her reaction, no drama even from friends and coworkers.
In the epilogue, set a month after they move together, they just live happily.

I think this could have been a good romance, Devon is a very interesting character, but the story remained on a superficial level.
It didn't work for me, but maybe readers who enjoy smut without a plot will find this satisfying.