HitoMoe Linkai (Cat, Snake, and Dog Transformations)

Thanks to Japan, we now have animal transformation hentai! HitoMoi Linkai contains over two-hundred pages of people turning into animals (or animals turning anthropomorphic) and getting it on. Most of the TFs involve females, but here are the dudes.
The scans are in Japanese and should be read right-to-left.

First, a man is seduced by a catwoman. Things get complicated when his wife arrives home:

Next, a man is swallowed by a snake and undergoes some non-digestive changes:

Here are two brief scenes of guys transforming after having made love to their dogs:

Finally, a look back with a brief recap TF:

The English version of this manga can be read here. Let's hope this is the beginning of a new sub-genre!