You can get a double sired clutch of spiders and pastels, I tried for that last year with three females but didn't get any double sired clutches. You unfortunately can't get bees since the males genes cannot be mixed within one egg. You can get double+ sired litters/clutches with any animal that has multiple babies since each egg is fertilized individually depending on which males sperm reaches the egg. So if you have two males, theoretically you would have a 50/50 shot on each egg as to who will sire that particular egg, but that's assuming all the sperm was introduced at the same time with the same 'power' which isn't going to happen. Out of all my clutches the pastel took every one of the females. Granted, the spider could have sired the normals that hatched out, but I'll never know.