Thor's laugh is unrestrained, unburdened by the weight of the crown and all the baggage that's come along with it. As it happens, he knows this one - thanks to Stark providing the soundtrack to several battles - and rather doubts he has the right voice for it. "Come on, brother, you can't let me sing it alone." He throws an arm around Loki's shoulder, hugging him close to his side so he can't squirm away.

It only takes a few tries to find the menu that lists duets, and his grin broadens when he sees one of the titles on offer. "Here," he says, stabbing the entry called Anything You Can Do (I Can Do Better), Irving Berlin. "If there is a more fitting song here, I dare you to find it."