Gwaine will proudly admit it was all his idea.
It all starts with that wretched hug ... that isn't a hug. From then on, it continues to nag at Arthur - Merlin's over-familiarity and affection - until he realises that not only does he not mind, he craves it. When events conspire to temporarily keep Merlin and Arthur apart, Arthur resolves to reveal his feelings as soon as he has a chance. Only, an unexpected mishap threatens to change everything and in a split second Arthur has to decide whether to come through for Merlin, or whether to let him go.