That unnamed mouse boy and the prey from the Paramouthpictures animation "Cat And Mouse".
(They got banned from YouTube so I had to go digging but I managed to dig up their youtube catalog)
Paramouthpictures YT catalog: https://mega.nz/folder/U4YTUbBY#__E7tRJnbrRtd8w5EcC78Q
[Some fine high quality G/t vore shit if I do say so myself.]