I don’t know if I misinterpreted your post. You say he wanted another one. Is skinny being paired up with a lone piggy? If not, as above, piggies are herd animals and not made to live alone. So please make sure (if skinny is a ‘loner’) that you pair him/her with a same sex piggy for company. No amount of human love or attention can replace company of their own kind.
I hope you were misinformed and are now up to speed so will be getting him/her a friend soon (if (s)he is alone). Best way would be to take skinny to a rescue and let them choose their own friend.