The Warlock Mooreflo

this dafaq was up with that convo with Varys and Oberyn? Watching with my unsullied father, and he had to pause it to ask what Varys agenda was. Honestly couldn't answer him. (I don't give him spoilers, just aid in understanding what we show watchers know) Just said his agenda is stayin' alive in Kings Landing (And again after he put a knife in Tyrion's back) ...more I think about it I not sure. Wasn't Varys in league with Magister Illyrio? Who was backing Dany?? ARGH All my brainblood in in my boner from the boobies I cannot think! Nah for real, how do I explain Varys to my unsullied pops with out giving spoilers/theories?