His first reaction was priceless. Nick introduced him to the baby (while I was still holding her) and asked if he liked the baby. He screamed "No!" and ran off. Same reaction when he was asked whether he wants to keep the baby... He seemed confused. So Nick picked her up and showed him the baby up close. Nick changed the question to, "Do you want to kiss the baby."
Kaylor's affectionate side definitely won out :).
Since then he can't stop peeking at her. Unfortunately he thinks poking her in her sleep will get her to interact. We're still trying to make him understand that doing that will just trigger a miserable reaction from her.
We asked him again today if he wants to keep the baby. It's definitely a Yes now.
PS:
The only thing that bothers him is that I take more pictures of her than him. So he tries to sneak in the pictures. :)
PPS:
And sibling aggravation begins: