Please do not try to pet him yet. He will most likely growl at you if you try it. He will let you know when he's ready to move forward. My Senegal although was hand fed when I got him, the previous owner left him locked in his cage for the last 3 or 4 months before I adopted. So eventhough she could barely play with him and scratch the back of his neck, he wouldn't let me touch him for like the first three weeks. Now this week, he's started letting me scratch the back of his neck and climbs up my arm to my shoulder, then across my chest and snuggles under my chin when he wants me to scratch the back of his neck.
He first came over to me while on my arm and got up to my face and started making the kissy face noise and then bending his head down. That was my clue that he was ready for us to move further along with our relationship. I call it making it to 2nd base. hahahahahahaha.
If you try to rush him, you will only be taking three steps back after make two steps forward. Let him set the pace.