Sundome, B-gata H-kei Recommendations
Both manga feature a sexually forward heroine influencing a below average boy, dragging him along an ecchi journey. Sundome can be more extreme, while BGHK is much more lighthearted, but if you wished for heavier situations, definitely check Sundome out.
Both of them have female protagonists who make the first move and male protagonists who are unable to do it where sundome is more on the perverted side as compared to B gata H kei which is more on the comedy side. Both of them are full of echhi