Lily held my hand firmly, but still tried to keep her nude body covered with her other arm. But since she only had one free hand she couldn't cover all of her exposed bits. For the time being, she had her arm thrust down between her legs and walked hunched over. However, her awkward pose still left her barely-there breasts exposed to my view. She was flat as a board so only her pink nipples drew any attention at all to her chest, but she still blushed when I glanced back at her.
"Since you don't have any clean clothes and I don't want you getting into my stuff," I said, "we'll just borrow some of Mom's. I'm sure she won't mind."
Lily's expression brightened, though she remained hunched over and visibly embarrassed by her own nudity. "Oh yeah," she said. "Mom's got a bunch of really nice outfits. I wish I could look like her."
I led her up the stairs to our mother's bedroom. The door was already open so we both walked in. The smell of Mom's perfume filled the air, especially when I started opening her drawers to look for something for Lily to wear. The first drawer I opened was Mom's underwear drawer, filled with a variety of panties all in different styles, from plain white granny panties to skimpy thongs and vividly-colored and -patterned bikini bottoms. There were also bras of many kinds, pantyhose, and more. Apparently our mother had quite an extensive collection of lingerie, and while I'd long known that she was cooler than most people's moms, she had the sort of outfits I'd only seen in porn videos online. The thought of Mom wearing these kinky little outfits gave me strange feelings that I weren't sure I wanted to dwell on.
"Hurry up," Lily said plaintively, shifting awkwardly between one bare foot and the other. "I'm cold." I glanced back at her. She was thin and awkwardly built, with skinny legs and feet that seemed too big for her, and utterly flat-chested, with her ribs beginning to show from being underweight. While she had inherited some of Mom's looks, she hadn't yet physically matured into a beauty like Mom. But the potential was there - even as sickly and underdeveloped as she was, she had an adorable face, especially when she bit her lower lip nervously like she was doing right now. I felt a swell of love for her as she stood there awkward and helpless, trusting me implicitly.
I glanced at her a few times as I rummaged through our mother's dainties. "What are you doing?" she asked. "What's taking so long?"
"I want you to try something," I said, and I withdrew a pair of small scarlet satin panties from the drawer. It was little more than a few strings with a flimsy triangle of silky fabric attached. "Put this on," I said, handing it to her.
She took the panties with one hand, still keeping her arm thrust down protectively between her thighs, and looked at them skeptically. "What...what are these?"
"They're panties, dummy," I said. "What do you think?"
"But..." Lily turned her body away from me so she could take the panties into both hands to inspect them. Of course, this just left her bare little bottom on full display for me to see. Despite her skinny body, her bottom was actually not bad. In fact, I'd often found myself sneaking peeks at her little butt in the past. At least one part of her body was beginning to develop, even if it was still scrawny compared to the other girls I knew. "But they're so tiny."
"So are you, in case you hadn't noticed," I teased. She stuck her tongue out at me. "Come on, Sis," I cajoled. "Most of Mom's clothes aren't gonna fit you, so I'm just trying to find something small enough that will." I paused in your rummaging and looked at her. "Just try them on, okay? You might just like them."
She gave the skimpy red panties one more glance and then reluctantly began to step into them. I watched as she pulled the little panties up her skinny legs and tied the sides at her narrow, bony hips. The satin red panties hung loosely from her waist, leaving a noticeable gap between the sagging fabric and her pink hairless cleft between her thighs, so she tugged them up even higher up her waist, until they covered her belly button.
I handed her more articles from the drawer to wear. She took each one and despite her dubious expression, she obediently put them on.
"You've gotta be kidding," she whined, "come on, Tommy. I feel weird like this. Can't I wear some normal clothes?"
Lily stood there before me in the tiny red satin panties, pulled all the way up, with white crotchless stockings that left the little red triangle of satin exposed. While the stockings would probably have covered our mother's legs up to her thighs, Lily had to pull them all the way up her legs to her crotch-level, and even then they still wrinkled at her ankles and emphasized how disproportionately big her feet were compared to her legs. She wore a matching red bra over her chest, though with nothing to fill it it gaped open at the top, exposing her nipples any time she leaned forward. She had on white opera gloves, though they bunched at the elbows and wrists and looked as though they might fall off if she let her arms down. She looked like a scrawny kid playing at being grown-up, trying too hard to look like a seductress.
I walked over to her and gently took her by the shoulders. "Let me show you something," I said, and turned her toward the full-length mirror in the corner of Mom's bedroom. I stood behind her and pointed at the mirror. "Look."
Lily looked at her reflection. Her face flushed bright red as she took in the sight of herself in her mother's kinky lingerie. "I look stupid," she said.
"No you don't," I said with a note of firmness. "You look grown up. Erotic. Sexy." She stared at her reflection for a long moment, then slowly began to inspect herself, turning to look at her butt in the skimpy satin panties. From behind, it looked like no more than a red string clenched between her taut young pale buttocks.
"I do?" she asked timidly, her voice barely above a whisper. She was blushing so much I worried she might pass out, and I noticed that she was trembling slightly all over. But she didn't look away and didn't try to hide herself from me any longer. I placed my hands on her hips in case she fainted. She didn't seem to mind me holding her.
"You're so beautiful, Lily," I said. "I know you don't feel like you are, but it's true. I was hoping that if I dressed you up like this, maybe you'd realize it."
"Do you..." Lily laughed nervously in disbelief, her blushing spreading all the way down to her flat chest, but she saw my serious expression and looked into my eyes with sincere vulnerability. "Do you really think so, big brother?"
I stood immediately behind Lily, with your hands still on her bare hips. As she turned to look up at me, her hip pressed against my crotch. There would be no way for her to ignore the feeling of my now-rigid erection throbbing insistently through my pants against her youthful lingerie-clad body. Her lips were inches from my own, parted slightly as she breathed, and her heartbeat raced.
===
What happens next? Does Tommy: