Lukey, you're adorable-the pictures are precious. To Lukey's parent, first thank you for giving this little guy a home, it's a wonderful act to take "just one more"!
Also, as far as the head sensitivity, don't take this as a sign of past abuse, it's not necessarily. My Tabby is very wary of people going near her head unless she knows you well. Once she does, it's fine, but she makes it very clear if you're new to her that the head is OFF LIMITS. She's not violent about it, just very protective. It's just a personality trait.
Welcome home, Lukey!