It may be self-indulgent, but it was self-indulgence with a point. Shannon might not understand the point of it now, but Eli will reveal the truth behind things when he feels that he needs to. He doesn't now, so all he's going to do is just be vague on it.

"That's Sir Mastermind Delacroix to you, troublemaker," he teased, moving his elbow nearly automatically so that Shannon could take it. "Spare bedroom. I'm going to need the bed so we can get the pants on without too much trouble."