Check this.. it all the series..
http://www.mangago.zone/home/mangalist/292034/
Do you mean what manga is the cat and the person is from? Cuz if that’s what you mean I think it from here. It has a couple of series but in the comments it tells you want order to read them in.
http://www.mangago.zone/read-manga/kuroneko_kareshi_no_amaekata/
Both the second and second last panel are veteran Sakyo Aya Sensei's work. She has a series of were cats with a lot of pairs including both shounen ai and yaoi. And her recent work was that of omegaverse.
http://www.mangago.zone/r/l_search/?name=Sakyo%20Aya
Anyone plz tell me whats the sauce in every last panel?