"I put these on for you, to look pretty for you. The silky slip and the gloss and the soft panties, to be your pretty boy," he rushes out with a gasp. "But I’ve already made my panties so messy. Even with the plug in I’m making a mess of my pretty panties." He thinks Marvolo will like this. Marvolo enjoys calling Harry names that don’t, in his opinion, fit, things like "lovely’ and "pretty’. He enjoys dressing Harry up in pretty things too, though those usually get limited to appropriately masculine outfits.