It's four separate doujins, all containing a variety of colorful content (the first is indeed in full color) containing tentacles, egglaying, pregnancy, and such... This one's for all the slightly more...

Here’s a Touhou doujin that follows the simple yet brilliant concept of a futa-loli going around sticking her disproportionate thing into pretty much everything that moves. A seemingly insatiable Mokou follows...

A cute little story of an innocent girl playing with her new toy. However, as with most things, her new toy eventually breaks… –Altereggo

Remilia teaches Flandre about the another way to feast on delicious humans.

This one is all about stuffing things into Tenshi's urethra and urethra fucking. Tenshi's a champ.