We'd assume by now that Peter is just an obedient boy who never gets enough punishment to fill his ego, and the truth is that one wat or another he always gets what he wants, which we all know now is dick! After licking/sucking Ron's feet he makes the boy suck his cock, and lick his balls, which Peter is happy to do, afterall it's in the boys nature to do so. Not long after Peter has Ron's cock just where he wanted it all along, and talking about all along, the boy takes it all way in before getting a facefull of Ron's cum!