I'm disappointed, I expected a link to TLS
I see you are a man of culture.
Lessons in Love and The Last Sovereign trade off in my head for the best-written adult game out there. It's hard to compare them though, so I waffle on which one is better.... The are about tied on plot quality, TLS has far better world-building and actual gameplay, LiL has better dialogue and humor. But the two of them are in a little bubble atop a mountain, well above everything else around here.
(It would be interesting to do a real compare/contrast between those two games, their developers, and their communities-- in most ways they could not be more different, and yet there are some import similarities.)
To keep it on topic though, they both are games with highly sexualized
settings but the games themselves are not at all about
sex. That particular high road is not Pink Tea's. Games like Elven Conquest are just sexy, kinky fun and the goal of the plot/world/story is to provide interesting immersion.