I wholeheartedly recommend Eternum. I think you're talking about the end of 0.5 and it just released 0.8. I haven't grabbed it yet, but usually wait to see if there's a bugfix or not. Each release is taking about a half year or so right now, but it's at least three to four hours of play if actually read the story and aren't a "skip to the lewds" moron.

You get a bit more out if you take side paths, but many of those simply eliminate LIs (though that's not true of a major path split in 0.7, but I can let you find out about that.
Walt is the mild mannered chemistry teacher dealt a bad hand; a change of wardrobe, and Heisenberg is the provider of high quality meth.