Any yaoi manga where the couple have kids or any animals in it? Or stuff like changing int...

http://www.mangago.zone/read-manga/kuroneko_kareshi_no_asobikata/
http://www.mangago.zone/read-manga/sex_pistols/
http://www.mangago.zone/read-manga/tadaima_okaeri/

They have kids and the seme is a dinosauroid.
http://www.mangago.zone/read-manga/animal_x/
Old art, but it gets better. Very sad tho.

Yaoi couples with kids:
http://www.mangago.zone/home/mangalist/211490/

Animal shapeshifting:
http://www.mangago.zone/home/mangalist/212908/

I don't know, if you go to like this one.
It is furry and omegaverse story, but it is very cute.

Pendulum: Kemonobito Omegaverse