Hold your gaze for at least 7 seconds, but not more than 14. Anything less is just a stare, anything more is just... weird.
TheProlongedEyeContactSuddenly vanish, leaving the object of your affections bewildered and intrigued. The perfect way to create a memorable impression.
TheSuddenDepartureAnd for the truly advanced, try:
Combine the Prolonged Eye Contact and the Sudden Departure for maximum effect. Your partner will be left wondering if you were ever there at all.
TheInexplicableVanishingAct