I found this manga touching... It basically outlines the development of feelings in a sex-based species (succubus) and how one such succubus gains feelings for our main character.
What could be considered "ecchi" scenes are no more than the "kiss" scenes from Rosario + Vampire... no more than is needed... and the worst is just over exposed clevage...
The most saddening part is not knowing when she will come out of the bottle again... and learning about lilim's past engagements... overall a nice quick read and a good plot line... not TOO stereotypical...