That's because the source material miss out the good parts: SlutWriter's story build up a cousins harem situation, then doesn't elaborate it more than a few lines. We get the foursome with John's mom, sister and aunt, then 16 hot cousins come living in the house and... NOTHING.
Nothing until Sluts x Studs story, but that is a What if? story and Tales From Herron House which should have been the focus of the story.
The comic should have put all material together instead of being so fragmented. Tales from the Herron House could have been more than one page shorts.