This is the best thing since sliced bread. This is revolutionary, butter on bread.
But seriously, I did like the story. It’s a 7-8 on the “one big whole family” genre, personally. The erotica was, I wouldn’t say unnecessary, just part of the package deal. Highschool DxD wouldn’t be Highschool DxD without massive mammaries; Welcome to Torano Detective Agency wouldn’t be Welcome to Torano Detective Agency without the gay sex. That’s simply how it is. If it’s not your cup of tea, that is perfectly fine— however, it wouldn’t be fair to say that the inclusion of such things diminishes the overall quality of the story proper just because you don’t like it. I think you should keep this in mind if you do plan on reading this but aren’t too sure about the erotica tag.