the imprint of your smile stuck to my heart

"You're staring," Taehyung mused after a moment, eyeing Namjoon out of the corner of his eyes. His eyebrow was raised but he didn't look annoyed. Namjoon couldn't deny it; he had been staring and what's worse is that he was sure he had hearts in his eyes. His gaze shifted as he felt his cheeks growing warm and Taehyung chuckled. Namjoon was enamored with Taehyung's smile, felt the imprint stick to his heart, warmth fluttering in his ribcage. "I didn't say you had to stop."

"It's impolite," Namjoon said, feeling properly shamed. "I'm sorry."

"It's okay. I was staring too, earlier. I just wasn't as obvious."

OR

Namjoon is forced to take shelter in a rest stop and meets Taehyung.