"Senpai!" the singer whined, moving away.
"Oh. Are you going to tell me you never used lip balm?!" Saito countered with irony, and motioned for Haruki to approach again.
The singer stared at him, yes he had used lipstick, lip balm, and gloss before, several times. And for that very reason, he knew that the way the mountaineer was rubbing his lip was filled with naughtiness. It was sexualized.
Saito looked at the singer's mouth, while rubbing his thumb in a calm and indifferent gesture, which made Haruki wonder, 'Did I imagine things?'
And in response to the request to approach, he took a step forward. Saito returned to rubbing his thumb with lipstick on Haruki's lips. The singer pushed Saito's hand from his mouth, annoyed.