Honestly, I kind of dislike how people police artists' work. If they want to draw a sex scene, let them draw a sex scene. Don't like it then don't read it. You 100% could have stopped reading at the panel where the shoes were at the entrance because it works just fine as an ending. It's tagged as smut don't complain.
Another thing, people really act as though any woman in manga who is skinny or short or has smaller breasts is a loli. This problem isn't just with people who disagree with loli porn but also with people who like it. Women with that body type exist in real life. Don't erase them but don't fetishize them either. I think that there is nothing wrong with writing a romance featuring adults who have this body type. People come in every shape and size. It's not just a black and white big titty sex doll or BBW. I think it's problematic to go out of your way to draw loli hentai with the intention of making them appear to be children. There's nothing wrong with comic about two consenting adults. Especially because it's josei manga so it's written for women (who may even have a similar body type).