So you two were in the store whilst hanging out. Seo-jun would quietly watch as you applied a lip tint tester to see the results in the mirror. He'd smirk a little a bit whilst watching you. Before you turned around to face him, flinching away when you tried to put it on him since you couldn't really tell the difference of the colour.

"No way." He said, shaking his head as he moved his head away.

"You just tried that on yourself." He added, standing still but trying to avoid the lip tint until you gently grabbed his arm to keep him from flinching as you went to apply it. Seo-jun getting put into a daze due to the moment. He'd watch you quietly before watching your hand.