I would like to find a game that has good sex scenes (2D an Hentai are fine) but I want it to be centered around seduction. It needs to be free with no download required (please no meet 'n' fuck).
I think you would like Artificial Academy from Illusion.
Artificial Girl is also cool but boring after a few hours.
Most seduction games follow meet and fuck ideas.
For fun try Akabur games, not quite seduction but transform a childish movie character into a public whore.
I never found a game based strictly on seduction and good AI to do it. And I played a lot.
And yes, you may need torrents to get the games above. (google for utorrent to download the client then google for game name kickass. Kickass is a good torrent tracker)
You can also search hongfire.com. It is a great resource for info about erotic games. And mods mostly on Illusion ones.