Light up : v.tr. « Light up is to set fire.
As wine has always been regarded as a hot substance, its fire is transmitted to the drinker.
In the XNUMXth century, lighting someone's lamp meant making them drink.
"Light up the lamp": drink a lot, has become simply "light up" (what is he lighting up!).
From the XNUMXth century, lighting up and being lit also designate a beginning of intoxication, an ignition.
Seduce (someone): entice, flirt.
A tease