No, what? Don’t be creepy about it. Just snap their picture and run it through pimeyes to find their address and live in their walls for a few years to observe their schedule and fears. Maybe replace all of their clothes with identical versions a single size larger and put an irritant in their bodywash to give them reason to question whether they’ve dropped weight due to a terminal illness, then complete their existence as they sleep and, as hard as it may be, platonically collect their eyelashes for your album. Just don’t be creepy.