It's the best situation ever! They get on well together, they don't have (or want) a boyfriend or girlfriend, they think each other is incredibly sexy and they get to have sex when they're in the mood with no commitment other than a shared pizza in bed after they've sucked and buttfucked until exhausted.
Aelin just loves having Dream lick and nuzzle on her thick cock and balls, and Dream is stoked that her buddy has such a gorgeous thick cock to plow her smooth asshole with.
They make out, tasting each others sex and passion, and then they suck, and they fuck, and they cum and they lay back in each others arms - each is in love with the other, but doesn't want to stay in case they ruin this perfect fuckbuddy situation.