This was absolutely brilliant. You really captured the genuine love and kinship that both Merlin and Arthur felt with Lancelot. I found it interesting how absolutely desperate Arthur was to keep Lancelot by his side, even after he found out about the betrayal. Lancelot was the first person that Arthur ever felt was his equal on all accounts and I'm pretty certain he had so many fantasies about doing medieval BFF things with Lancelot and he was preparing to have a lovely little bromance with him, so it just crushed his soul when he found out that Lancelot wasn't as perfect as he thought he was, but he still wanted that connection with him, and his heart most certainly broke when Lancelot left on his own accord. It's also interesting that Merlin never once felt threatened by the Lancelot/Arthur friendship, and actually encouraged it. Pretty much everyone was madly in love with Lancelot in this episode, even Uther, so I can probably believe that Lancelt/Everyone In Existence is a valid ship.

Wow, did not mean to write that much. Er... anyway, I enjoyed this, and you definitely convinced me of their OT3ness.