I just thought about this, but there is a very high chance that the author might just go for a very neutral ending because of the backlash, with both parties now with different partners, and either making peace with each other or maybe even not meeting at all. This way the author does not have to compromise on her ntr fetish, by not having to make Sakura experience any sort of guilt or consequences, while also not angering readers further by not making shinobu your average ntr cuck and him moving on instead. A big cope out but probably what it going to happen.