KLAUS stayed for as long as it took for his siblings to show up, probably flirted a little with Thor and Tony, complimented Pepper on her outfit (but did not ask to borrow it, it's not his style), and gave Peter the biggest hug, along with a gag gift, and for a real-er gift, got him a Red Dwarf box set.
(Note: His crutches would've fallen everywhere and he is sorry.)