For me it was Light of my Life. I always found the girls very strange, they looked like goblins, but when I started playing the story is so good that you end up forgetting that. Today it is one of my favorites and the oldest daughter was pretty hot.
Once I played Summer Scent and when I finished nothing had happened in the game, I said "this game sucks". Then I played with walkthought and saw several hot scenes. So I think it's worth using Walkthought from time to time.
I recommend Big Brother (despite being abandoned, it's still a great game), Timestamp, Her Desire, My new Memories, Light of Life, Cumona Beach and Living with Vicky, this last one the MC is a bit creepy, but the game has a very good story.
I recommend A Ghostly Desires, the focus is mostly on older women, it has great animations. However it is a sandbox game, if you don't like this type of mechanics could be a problem.