Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @LostGermain ' Want to have a spar?' The prince smiles and reaches for his hilt and his icy eyes keep on Aaron, a playful look in his eyes.
This tweet contains emotions: 
joy