Riley used to do that. As he got older he would also stroke my face, prod my face, play with my hair. He did have one nursing bra which he loved to hold onto, so much so, that when it was in the wash, he would often freak out because I was wearing a different kind. I used to wash it at night and pray it would be ready by morning sometimes!
He also went through a phase where he would hold onto one of his ankles while nursing, whcih was adorable.
I also remember guiding his hands to a little toy at times as he was quite strong and would hurt me at times, not meaning to, of course.