Karen and Tsukihi don’t have sex with their male hero, the main character in the Bakemonogatari series. Yep, I did use a negative form, when I read the last of the 35 pages I was in shock, what, so he didn’t even get to shove his dick inside them?!?
However, he fingers them a whole lot till they cum hard and spit out lines that if he continues they won’t see him as a brother anymore, the drawings come censorship-free and we have amusing comedy. That ought to matter, right?
That kind of hentai work leaves me nonplussed, both very pleased, and terribly frustrated, haha. That was the obvious intent of the mangaka, to tease us hard and deny us the hopes to see actual sex place, so: good job, mangaka-san, good job!!