The very idea has Sylvanas scrunching up her nose in disgust; the idea that Arthas was even capable of such intimacy is simply beyond appalling.
Aaaand now I’m thinking that’s Arthas and Jaina were doing while the players were dealing with Falric and Marwyn in the Halls of Reflection.
…it certainly explains the line: “Falric. Marwyn. Bring their corpses to my chamber when you are through.”
Some people need a cigarette afterwards… Arthas needs to raise people from the dead.