1. In the first I think Arthur and Merlin were travelling somewhere with a group. Merlin falls in some water or something and gets sick. I think he catches pneumonia and it is getting worse. I remember him riding in the cart and Arthur worrying. Also Arthur was reading about the new religion and talking about praying to the new god.
* FOUND - Light of Arthur
2. In the second one, I believe everyone had a dragon that you were bonded to so you could feel what your dragon felt. I think everyone lived in caves. Sorry if this is vague. At one point Arthur and merlin's dragons are attracted to each other and sexytimes ensue.
Both should be Merlin x Arthur pairing.
Let me know if these ring any bells. Thanks very much.