Total Recommendations: 2
If you liked
Nana to Kaoru
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...then you might like
Hantsu x Trash
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Both are romance ecchi that focus on story over ecchi, but blend the two quite nicely. Both feature good character progression and the stories are enthralling. Art styles are a little different, but both are good. Nana to Kaoru is quite catching and I had a similarly enjoyable experience reading up to the current chapter (in one sitting of course) in Hantsu x Torasshu.
If you liked
Minamoto-kun Monogatari
|
...then you might like
Hantsu x Trash
|
Both are romance and ecchi that use ecchi to advance story points. Minamoto-kun is more closely related to smut, so be warned. Both feature male characters growing into men, and character progression is the focus of both, not the ecchi.