Francis uses a Latin construction known as “cubitum eamus” (meaning “elbow rest”) when asking Richard whether or not they want to sleep together, an uncommon but appropriate usage in prose composition classes (only seen a handful of times in Cicero Dictionaries used by undergraduate latin prose composition students and rarely later), though rare in modern usage; its application suits this context perfectly; similar to how certain verbs can use “supine of purpose”.
What could this possibly be? : Nothing extraordinary under the sun.