I dunno, it looks like he's letting her do it. After the first hit she gestures at him with the shoe and then at his dick with the shoe and he puts his arms to the side... This looks like it might be some kind of fetish.
An individual is special needs if they have special needs. For instance, am individual who is physically or developmentally disabled is special needs. My younger brother who had tuberous sclerosis is special needs, as his condition has caused mental and physical developmental problems for him.