Carefully slip out from under her arm and get dressed quietly? Maybe she won't wake up if he's careful enough. And, well, she possibly knows he was asleep first, so if he's just out of reach long enough for her brain to kick in and Mario to explain, the two of them can start wondering together just whey they were put in the same room?
My first thought was, "Yes, a Prowl roll with a bonus would be accurate," but allow me, for the sake of Mario's survival, say instead, "No, no roll is needed." I don't really want the dice to have their say in whether Mario lives or dies.
I just love the difference in approaches between Toph and Elinor!
Toph: "Am I trapped? Can I get out of this room? Is the door locked?" True Meltrandi warlike suspicion to the tee!
Elinor: "Shucks, I'mma hafta talk to Miss Iris an' Space Case Sammy here about what they stuck in our vittles. Good mornin', world!"
Meanwhile, with Mario: "Good morning, Lieutenant! Don't ask how I gained entry into this room where you're sleeping! Please!" =)