Daniel sent her the happiness he felt when with her, his joy that he could make her feel this way. He saw the thought, but, sensing her feelings about it, made himself ignore it for the time. He knew she could tell he was though.
YKYASF when your history teacher is going on about the Industrial Revolution and asks what an alloy is and you get very excited to answer. And then when he mentions steel you really want to make a allomantic joke about why it is so useful.