To start, the other work of Sixth which I read was "I Like them big, do you?". That story was the sort of benchmark I used going into this one. From my standpoint, it looks like you went for something much more casual this time with "My Wife's sisters". and it worked. It was a light-hearted, fast paced story with a little added depth. Overall, it was a good story. Now for the negative. The ending, obviously. To give author credit, with how light hearted and somewhat lacking in depth this one was, the immensely lazy ending didn't leave a bad taste in my mouth; in fact, I was expecting it, with the story only 120 odd chapters... extremely short. As opposed to "I Like Them Big", where you put a lot of work into the characters, setting, and plot; in which case it made the rushed ending in that one SO much more terrible. In my humble opinion; you have what it takes to write a fantastic novel, from cover to cover. Take the depth, and lead and side character development of "I like them Big" (and the awesome MC), the light hearted Romance and conflict of "My Wife's Sisters", mash em together and you have a fantastic recipe for a harem novel. Obviously, plan to write a MINIMUM of 500 chapters (of course, you can always write much higher word count per chapter instead which I STRONGLY recommend), in order to give yourself plenty of room to fully flesh out the story and characters and give a PROPER resolution to the story. In my experience, a conclusion of the average novel will be a few chapters long. Again, you have what it takes man, and I really hope to see you put a new work out and put your skills and motivation to the test. Write the perfect harem story! haha