 If you liked
Eiken
|
 ...then you might like
Zokusei
|
the art and story are by the same mangaka. both are tales about a boy and his interactions with females that all have very different personalities and varying feelings toward him. It is also loaded with fanservice and the boy, who is unsure of how to conduct himself in those situations, tends to be teased by the more assertive girls.
I Eiken made you laugh or gave you that warm fuzzy feeling typical of ecchi manga, then Zokusei will too.
And vice versa