This is the comment from meus_venator that I wrote When The Cat's Away for:

Filthy rich and reclusive inventor Dr.Jensen Ackles is fed up with being taken for granted because of his looks. Time and time again he has to break up with shallow gold diggers who only see his good looks and large wallet. And he's busy, he has work to do, he can't spend all his time courting, when he needs to splice more genes. So instead of going out on the market again, he decides to build himself a boyfriend. The only problem is he leaves the cage open on one of his test animals and it gets introduced into the mix