An oral sex course results in an oral orgy

There's no place in this world for bad oral sex so these two men and two women are taking an 'oral sex course'. Their teacher is a pretty blonde who's pretty hands on in her teaching methods. She just can't resist joining in! After teaching both girls how to suck cock it's the turn of the guys to learn how to lick pussy. By then the teacher is nude as well and all five of them get into a full blown oral orgy.