Trying to figure out Pisces co-worker

I want to attempt to make "outside" work friends with him, but I'm not sure if he would be open to it, or if its allowed because he is a manager. He says he is an introvert, but at work he talks my ear off(I don't mind) and also tells me personal things(but never mentions any female he may have, be seeing, or be interested in). I remember one time he told me that girls who work at the store usually have a crush on him, I LMAO and told him he as an ego, then he said "I dont, I'm just telling the truth and wouldnt want to make someone feel awkward about having a crush on me". When its just me and him in the store, he acts super goofy and we joke around a lot. I also noticed that most of my shifts are scheduled with him. I'm an artist and will be doing a tattoo apprenticeship soon, and his friend/fellow coworker told me that he said he would let me tattoo him.

Does it seem like he would be open to being actual friend outside of work?