This past few day your lips starts swelling usually when you wake up.You asked Zach for his credit card to buy all of the lip oil Google will recommend you. he took out his card he says "why? "

"my lips have been swelling lately, here" you said while pointing your swelling lips

"oh, poor thing" he said as he caress it with his thumb and slides the card into your pocket.

What you didn't know, every night zach will kiss your lips passionately, slowly, yet aggressively while you slept.