So I was thinking; @
fenic!
-maybe a DS cat falls for him, and once she bears kits, Apollo wishes to take one of them. But she can't give him the kits, due to DS laws, so he becomes furious and... plot xD (this ain't much of a triangle, but ehhh)
-two friends each fall in love with Apollo, and because of this, the friendship breaks apart and each of them blame Apollo for the disaster; the two 'friends' become rivals and ask Apollo who he loves more.
-one of Apollo's companions has a mate (Ima call her shecat1 for less confusion). And being the molly she is, the Shecat1 cheats off of her original mate and flirts with Apollo instead. And she bears Apollo's kittens. Although she knows this, Shecat1 lies and pretends that it's her mate's kittens. And once the kits are born, Apollo notices that they bear more of his traits rather than the mate, so he becomes suspicious and basically confronts all of 'em at once.