we do have the room...and he knows we do!
he's not a huge fan of guinea pigs (BOOOOOO!) he thinks they're weird haha, but does tend to ignore them.
i did show him the picture of them, and he did say they were cute (which was an achievement!) but then i kept saying "look at them, they're adorable, we need them!" and he was like urmmmm, they are adorable, but we don't need anymore.
ALTHOUGH, he has said to me he will help me with a guinea pig rescue when we own our own home

(currently saving for a mortgage!) which I guess is a plus point! & if I cannot convince him I have that to look forward to
i should also add, we'd been talking about getting gpigs for a while before my two, and it just went round in circles, he said no i said yes, then one day he came home from work and there was their cage, with them running about. i think he was shocked more than anything!
he did let me foster too. and even inquired about fostering a rabbit, so he does care

but 2 piggies and their forever homes with us may be too much to spring on him
i will keep trying, and pushing and pushing, and fingers crossed!