>>2802094Homura got used to not wearing underwear during her long stay in the hospital, and for the month she was out still had not gotten accustomed to it again. After getting stuck in the timeloop she stopped wearing any out of shear indifference. She spent most of her time in her magical girl costume anyway, and it didn’t feel like it came with any. Also when she wasn't in her magical girl costume she wore pantyhose so it’s not like anybody would notice. It was just one less thing to worry about when every moment of the month needed to be optimized.
However, she started getting a perverse thrill in some of her interactions with the other magical girls. She knew that she had quite the camel toe going on, so perhaps she would stand over a defeated Sayaka and plant her foot on her chest, enjoying how the girls defiant retort got caught in her throat as she saw that Homura wasn't quite decent down there. Or she would lay on Madoka’s bed and let her skirt ride up just far enough that the pink haired girl gets flustered and tongue tied. She quite enjoyed figuring out ways to keep them off balance.
And she learned all about her fellow magical girls perverse quirks, becoming quite the voyeur with her time stop ability.
So it’s no wonder that when she became a demon, her wardrobe flaunts her lack of undergarments. Or that she entertains herself by engineering all sorts of of pantie related mishaps for Sayaka.