Nipple pig... To really satisfy this guy I would attach the leash to the chain of the clover nipple clamps and pull like hell... I would then lead him around on his knees and until he begged for mercy...
That's what this boi really needs and craves! I can see it in his eyes! Plus, if he is a good boy and only if he behaves he might get a prize while on his knees...
Fortunately he looks like the obedient type...
http://68.media.tumblr.com/f8ceb54438dd62de1995940875740061/tumblr_ohmxepQVup1sjna1ho1_540.gif