When you think about it, most manga are just coloring books with a story.

The most helpful review:

"This book is a treasure trove of Safe For Work Milfs! They're suggestive as hell, but don't worry about any potential nip-slips in this nut-buster of a book! You won't need any white crayons, you'll be supplying your own white ink for these coloring in activities! It's great for family bonding, and teaching your kids the wonders of big boobed anime girls from a young age. I personally loved spending my daily commute coloring in some beautiful Hentai ladies"