I can't give a specific order for these aside from number 1
1. I Love Daddy - Amazing game with great branching story. I played through all 10 endings and the subendings.
2-8
My Sweet Neighbors - if you've played DMD then you'll notice the similar mechanics. However, don't let the comparison to DMD scare you. This game is fun, the characters have complexity, and they are hot. Definitely one of the better VN out there.
Wicked Choices - Possibly the best writing I've seen in any adult game I've played. The story is interesting and the sex is amazing.
Good Girl Gone Bad - Though I Love Daddy has a female protagonist, I would actually call this game the best female protagonist game I've played. This game is very well written the characters are all interesting, and it's the only other game I've gone back to to experience it in different ways.
Deviant Desires - This game might be the third game I go back and play in a different way. I love this game so far, and I want to see more. If Wicked Choices has the best writing, this is the close second.
Dreaming of Dana - one of the most plausible incest stories out there. This game has the strongest female characters outside of GGGB, and another game I'm about to get to. The plot is interesting and It managed to be a life sim while not sucking.
Intimate relations - Made by the same person who made Dreaming of Dana, Intimate relations is also amazing. The female characters are well written, and the mechanics are really unique.
Dual Family - If Dreaming of Dana is the most plausible incest story, Dual family is the incest story that this community most needed. This game is so much more than erotica, it is a commentary on the incest genre as a whole. Throughout the playthrough as the son you're confronted with the fact that you're heading down the path of the sexual predator. Throughout the playthrough as the father you're seriously conflicted in your feelings toward your daughter. And all of these characters, the mom, the daughter, the niece, the aunt, have their own personality. They are some of the realest characters out there. This game is depressing, but so very worth it.
9. Dreams of Desire - At first glance Dreams of Desire looks like a life sim, however as it progresses you learn that its really just a VN with a life sim skin. I personally really like the little sister model in this game. That said, I treat this game as a guilty pleasure. The story is contained and it keeps you wanting more.
10. My Girlfriend's Amnesia - This game is in the number 10 spot because the dev decided to make it with RPGM. It actually has a very interesting plot and great animations and models. The only problem is that it was built on a format that makes it feel clunky and, due to the inability to save during cgi scenes, makes you have to replay half an hour to fix a mistake. Seriously though, I hate RPGM and this game still makes the list, you should play it.
EDIT:
This has changed a bit since I posted this. A solid Number 2 slot has been filled by Coceter Chronicles. Seriously this game is amazing. When it finishes it might even take my number one spot. Holy fuck. I love this game.