'Advice'(2)
As Liz and Will heard the innocent question from Derek, both of them could only stare with shock as the door opened to reveal them in a very compromising position.
Liz's hands were around Will's neck, holding his face close to hers and Will's arm was pulling Liz by her waist.
In a flash, they managed to extricate each other, but that was enough for little Derek to understand what was going on.
Putting his hands on his mouth with surprise, he shouted in a high-pitched voice that made both Will and Liz blush together while the former rushed to wipe at his mouth to get rid of the incriminating evidence.
"I get it! Sis and boss, in the car, K I S S I N G!"
It didn't rhyme very well, but Derek chortled at his own creation, as he repeated it continuously while zooming away.
Even before Liz could say anything, Derek was already near Mary, singing his little rhyme while Mary glanced towards the car with raised eyebrows.