As long as the two are together, they are content. If you choose to take one of them for a walk, expect the one remaining to become extremely agitated. So agitated that he may jump the fence or do damage to himself in an attempt to join you. Even in herd situations, llamas show concern when one is separated from the group. Shelter and fencing.
Many llamas live without any shelter but trees.
It can be done, but it isn't an ideal situation. Some protection from wind, snow, rain, sun, and lightning should be afforded them. Fencing for any kind of livestock of similar size should be adequate. Barbed wire is a poor choice since they rub against fences and poke their heads through the wires and the barbs can easily injure their prominent eyes, or rip into their skin. Males close to one year of age should not reside with females.