Question about my silly clown fish?

[Lovemyocean]

So I have two clowns paired clowns that were given to me and hosting a leather coral. I had two smaller clowns already and one didn't make it. So I have 3 altogether now.
Here's the odd thing. The two biggest ones at first were super territorial of there leather but now they seem to have accepted the smallest one as one of there own. And he is just loving it. (See photo) The smallest one seems to never leave it besides for food.
It almost looks like they have chanced mates. Is that possible?
Or are they just sharing they leather now that there is only 3 of them?