I work in a lab as a volunteer. I bring in first year students, explain the experiment, strap them to a chair, put on a helmet and turn off the lights and monitor their progress from my computer. Most of the students that come-in are young females (18-19). I like to think i get some IOIs (smiling, girl looks down, becomes very quiet, upholds small talk before experiment starts etc) from girls. Should I make a move and ask them for their number AFTER the experiment (when I turn the lights back on and release them from the chair so they are standing up and can safely leave) if I sense attraction vibes? If so, how would I go about it?