system
joyful: I loved seeing my nephew open his birthday gifts. He was full of pure happiness.
human
My nephew just had his birthday party, and I loved seeing how happy he gets when he opens his gifts.
human
Happy birthday to him! What did he get? 
human
He got some awesome gifts like LEGO sets and color books. He really is creative!
human
I bet, those sound like awesome presents!
human
It's just so cool to see how happy children can be in their pure moments.