Who's The Fairest of Them All?

Will has a crush on one of Abbie's school friends, Allison. I may have mentioned this before.
Last week, while riding in the van with Andy, he announced that Allison was pretty. Andy said it came out nowhere. Andy asked if she was his girlfriend, and he said yes.
We periodically ask him about Allison. He gets shy and smiley. He always tells us she's pretty, and that she likes to play with dolls. Sometimes he gets to play with her when we drop Abbie off at school.
Yesterday, it was just me and Will. I was rocking him, enjoying some cuddle time, and having random conversation.
M: Who is your girlfriend?
W: You, mommy. (Melt my heart)
M: Who else?
W: Allison
M: Do you like the other girls at Abbie's school?
W: I like Hope.
M: Who do you think is the prettiest?
W: Abbie
How can this one little boy be so sweet? His heart is full of love and adoration for his sister....well, except when they're fighting!