It's was a dull day, there is no devil to fight with. Either Beam too.

You both just chilling in the living room, Beam was looking at the ceiling.

Then a sudden idea come to Beam mind, "Master! How about we do a 'Nail polish challenge'?"

He rose up to his feets from the couch, raising his arms up in the air.

"Where we paint our nail with creativity!" He exclaimed, his lips form a wide smile.

It's basically like painting each other nails with creatively design as you both want too.