...
I have finally found an animal-sex inspired fanfic that is weirder than the marsupial mpreg series in SGA: Ballistic Penises and Corkscrew Vaginas by 
longsufferingly. It's J2, but not even my RPF squick could stop my curiosity after I watched the linked videos of duck penises that were the inspiration.
longsufferingly. It's J2, but not even my RPF squick could stop my curiosity after I watched the linked videos of duck penises that were the inspiration.