On a cushion, at the floor

"Oh, there you are..." You say with a smile as you find your guest having made herself comfortable, now kneeling patiently on the floor and seated upon one of the cushions taken from your couch. "You always prefer the floor over a couch?"

"It's just for the better height." She says and looks up at your face while you put the glass of water at the small table beside her. "You got me here for a reason, right?"

"Ah, yeah!" You agree with her, pretending like you've almost forgotten about it even though your cock grows has grown steadily harder in your pants since you arrived in your appartment. "But, are we in any real hurry here...?"

"A life time doesn't mean forever." She shruggs indifferently, but refers rather grimly to the actual wordings of your wish. "And you did imply for only one activity, upon reaching your appartment."

"Well, that may be subject to change actually..." You start saying, while opening your can of beer, and then take a sip from it while taking a moment to think. The actual applications of your wish would not prove so practical after all, and you're quite certain you didn't mean it in any way like her life would be short enough for but a single long blowjob...!

"How about we change that 'the rest of your life'-part to 'until I say that we try something else'?"

"Works with me." She agrees, again with that impassive shrugg like she couldn't care any less about getting the rest of her life back... "But again, when do we start?"