If you mean shape-shifting uke then you could try reading the most popular like Sex Pistols, Wild Rose and Wild Fangs, Oinarisama no Honey Bunny, Hyper Love Power, Kuroneko-series and Sentimental Garden Lover.
Other cute ones are Shisei Gokumon, Tatsu no Otoshigo or Ayashi no Kimi no Koiwazurai. But I can´t guarantee that the plots are all that great, sorry!
Otona Keikenchi?
Here are some lists:
Kathy's Animal Transformation/Characteristics List:
http://www.mangago.me/home/mangalist/934/
Blue's Animal Like Behavior/Imagines or is an Animal:
http://www.mangago.me/home/mangalist/22015/
Morcheeba's Animal characteristics - yaoi/shounen ai:
http://www.mangago.me/home/mangalist/26067/
Sakuracry's cat-ears or other animal-ears:
http://www.mangago.me/home/mangalist/7547/
Other one:
KyoZaNa✿'s Shape-shifter ● Vampire ● Merman ● Demon:
http://www.mangago.me/home/mangalist/1491/
hi!!! I would like to find a yaoi with a half animal uke... I tried finding a good one but all the ones I found didn't really have a good story... Thanks in advance!!! (￣∇￣")