My big boy likes to preen me. It can be my shoe or my thighs/legs when I’m sitting. Does this mean he enjoys being around me? Here’s a picture of him sitting on my lap right after.
He may be thinking you are a part of his flock. Hard to say if he likes you, or is just grooming you like he would a hen. Hopefully he remains respectful.
He is in the darling stage. It often times does not last. Enjoy it while it does. Do be aware, often times this type of bird can become very aggressive. Not saying he will, but it is a strong possibility.
Social preening indicates trust in birds (a broader aspect of birds beyond just chickens). All of my cockerels and roosters preen me if I preen them, especially if I help them out areas they have trouble reaching themselves. Many of my hens do the same if I'm wearing a fluffy sweater or something.