[viridian]

When Di studied hospitality, she lived on campus at the university, an hour's train ride from the city. She stayed at an old historic mansion owned by the university, which she shared with several roommates. The grounds were gorgeous and they had plenty of privacy. Di liked it there, though a couple of her roommates were quite obnoxious. As the only hospitality student, she often did the cooking, being the only one there who knew how to cook anything other than ramen.

Di would return home by train every weekend to spend time with the family. This time no one was home and Lisa was at her dance lesson, so I offered to meet Di in the city. I met with her at the station. As usual, she left all of her belongings at the university and was empty-handed. She wore a dark grey dress with short sleeves, buttons down the middle and a cloth belt. I offered to buy her a drink and we went to the coffee shop, where we had a chat about how things were going.

"Oh my god," she blurted out during out conversation. "You won't believe what my fucking roommates did."

"Hm?" I replied. She only swore when she was really, really angry. She told me of what happened the previous night, when they were having a movie and games night. Di couldn't drink because of her condition and was content to clean up and get the roommates not to do anything too stupid. While she was helping someone in the bathroom, someone had done a panty raid.

"They took ALL my underwear," she hissed, stressing her words. "I was fucking PISSED."

"Did you get it back?"

"NO." She gritted her teeth. "It was SO embarrassing."

"What was?" I kind of knew what she was getting at, but I wanted to tease it out of her. She looked down and started to blush. She wasn't wearing anything underneath her dress. Though the fabric was thick, her nipples were faintly visible and her breasts could be gleamed through the gap between the buttons. Worse, her skirt was mid-thigh in length and was slit down the front. While I was amused, I noticed that there were other glances from around the coffee shop.

"We should go," I said. I nodded towards her chest. She mouthed "oh shit", realising that her nipples were visible. We made a hasty retreat to the station. I walked in front of her and held her hand to avoid drawing too much attention while she held her skirt down. We had a risque moment when we went up the escalator, but thankfully no one took any notice of Di's embarrassment.

We got on the suburban train as soon as it arrived on the platform. It was peak-hour and we were crammed in like sardines. Di was pushed against the door while I was right behind her, one hand bracing against the door jammed between her body and the glass, while my other hand held us steady on the bar. It was an awkward moment for sure, and Di wanted to get home as soon as she could. She had claustrophobia and the packed train was starting to make her feel anxious. What was meant to be a 20 minute trip went wrong when the train stopped soon after we left the station. There had been an incident down the line and we had to wait until the driver was given the green light.

I noticed Di was breathing heavily. She was on the verge of panic.

"Is there something I can do?" I asked.

"Just take my mind off things," she said. "I need to get out."

I had an idea. It was a little silly, but I knew it would work. "Don't tell Lisa about this."

At first she was confused, but then she felt something move against her torso. My left hand, which had been pinned against the door, pushed against her left breast. My fingers brushed over her nipple. Her body suddenly shook. "Shh," I whispered into her ear. "Just take your mind off where you are."

I squeezed gently, letting her feel my fingers through the fabric of her dress. Her large, D-cup breasts were much softer than Lisa's and felt heavier. I cupped one and pressed on it, closing my fingers over her hardening nipple and rubbing it gently. Di had never been touched there before, and the feelings going through her body now was something she had never experienced before. I took it slow, not wanting to overwhelm her. It was definitely keeping her mind off the situation though, and while I felt a little dirty groping my girlfriend's sister on the train, I felt partly justified in doing so. Her breathing grew heavy as she closed her eyes and leaned into me. She pressed against the bulge in my pants and I gulped. I slipped my fingers between her buttons and felt her flesh. Her skin was rough, but the soft breast was appealing nonetheless. I couldn't fit through and couldn't touch her other nipple, and I went back to massaging her breast from the outside. She said nothing during this. I noticed her own hand slipping down into the slit of her skirt. I knew she was enjoying this.

We were stuck for only ten minutes, but they felt like very long minutes. We stopped as soon as the train moved. I glanced around quickly, relieved that no one had noticed. All faces were stuck in newspapers, eyes closed with iPods in their ears or otherwise glancing aimlessly out the windows impatiently. The rest the journey continued with incident. The train emptied as we got closer to our stop, making it easier to for Di to breathe. We even managed to get a seat by the window before our stop.

"Hey, you alright?" I asked as we walked home.

"Yeah," she replied. After a moment, she added, "Thanks."

As I slept with Lisa that night, I could make out some faint moaning in Di's room next door. I snuggled into Lisa and started feeling her up. "You've been pretty horny recently," she said to me. I said nothing as I kissed her and took off her top.