Shake his hand with a casual "yo" - but secretly I would have the hidden agenda of seducing him. He would have no clue what hit him later on. Or maybe he would, considering his abnormal intelligence. I could always win him over with strawberries!
So many things to react or say DX
I think I'll ask him to watch some anime or tv shows (Law & Order: SUV, etc) and try to snuggle with him with the blanket wrapped around us.