 If you liked
Nana to Kaoru
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 ...then you might like
Hantsu x Trash
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Known for their ecchi gimmicks, Nana to Kaoru and Hantsu x Trash has your typical MC who gets acquainted with some very attractive women. In both series, they get into very controversial circumstances with them that almost always gets them into trouble. Additionally, there is a very peculiar chemistry that develops between the MC and the main female character. Hantsu x Trash is also known for its additional element of water sports.
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.