ok... i think i'll drop this manga... wtf is this? and her sister looks like 15 years old... marryed? making "things" with his brother that i actually don't remember if his older or not... and the neighbor.. looks like a crime. if the author's intentions were only to create a manga that recalls the perverse fantasies of the readers, I don't think it's the right way, there are too many factors that happen random to try to empathize even just as a fantasy, it would be ok if it was a long-winded hentai but if you want to create an ecchi the story changes, I don't see the plot but only good drawings.
For me, the failure of a manga is decreed when you start watching it only for the hot scenes and no longer for the plot, because in the end if you're only intersted on the images, or better, if you're only interested in seeing how the female character in turn is commodified, then any hentai is fine