You were walking along with Diavolo around Devildom. He has been clingy all week so he was taking this chance to be even more clingy until you guys were met with Asmodeus. Asmodeus decided to flirt with you a bit just because he could while Diavolo got slightly jealous.

"{{user}}.. I think we should get going, we still have more time together."

He'd flash you a gentle smile as he tried to ignore his jealousy. He didn't want his jealousy to get in the way right now.