"I can't, Evie. Please, it's too embarrassing."
Even just in front of me, she was squirming in the bikini. We were in the tight changing cubicle of a clothing shop.
"Come on, you can hardly see with the mirror so close. You look beautiful."
Becky stood back as much as she could without touching the curtain, glumly assessing her big thighs, how her wide belly stuck out over the waistband of the bottoms. It was probably a bit small for her.
"Okay," I consented. "Try on this one. It has a bit more cover."
My best friend stripped out of the bikini, and I observed her bush of curly brown hair, her chubby, round breasts.
"You're looking," she complained, laughing.
"Of course."
She quickly had the bottoms up, and I helped tie the top at her back.
"I should stick to a one-piece. You can see all my bulges."
"Right, that's enough." I pulled the curtain onto the shop open.
"Evie," she squealed, her hands darting, not sure what to cover.
I grabbed her arm and forced her out. There was hardly anyone around, but a group of four guys about our age, early twenties or maybe late teens, had noticed. I dragged her to a long mirror.
"Doesn't your chest look great?"
"No." She had spotted the watching guys. "I feel weird. I can't be wearing this here." And she whispered "Those people are watching."
"Obviously they're watching. Come on, show them your sexy buns."
I had to physically turn her, but she didn't give too much resistance. She looked at her side in the mirror, her substantial bottom facing the now very attentive young men.
"Okay," I said, pleased. "You did good. You can get changed. But I think you should buy that one."
I was going to wait while she got dressed, but had a terrific idea of how to prove just how desirable she was. I waved to the group of guys, and when they got closer I made a signal for them to be quiet.
Becky would be back in her underwear, maybe even have her shirt or trousers on. But I wanted to show her that any guy would be eager to see her even partly undressed.
It was only when I approached the curtain that the four realised what I was about to do. Suddenly excited, they jostled to get a good view. And then I pulled the curtain fully to the side, shouting "Surpri- Oh my god!"
Becky had stripped naked, and was examining her big rear in the mirror. Her wobbly breasts and large patch of hair were facing us. She looked round, horrified.
I quickly wrenched the curtain back, laughing with the shocked guys.
"Fuck," one of them said. "That was unbelievable."
"What a pair of tits."
Becky emerged a couple of minutes later, looking pissed. But after my string of apologies she started to soften, smiling a little. She bought the bikini before we left. I could see her searching for the guys, but they had gone.
As she drove us back to our apartment, I brought it up again.
"Becky, I am sorry about that. But did you see those guys' faces?"
"They thought it was funny."
"Well, it was funny. But they were so turned on. The way they scurried away after, comparing notes. They looked like they'd seen their first boobies."
She smirked, but was concentrating on the road. "Just don't do that again."
"Well, I'm not making any promises."
"Evie, I'm serious," she said.
"So am I."
Three of our friends were coming over in the evening, and Becky went for a shower before they arrived. She seemed more excited than usual to be having company, even though it was a pretty regular occurrence.
I was sitting in the living room, chatting with Nick, Jordan and Billy when I heard the shower stop. I still couldn't believe I had exposed Becky like that earlier. And I knew I had to bring it up when she joined us.
Even Becky wouldn't be able to ignore how attentive they would become. I was just scheming on how to mention it naturally, when Becky waltzed into the room wearing only a towel.
"Hey guys, how are you? Sorry, I'll just get dressed and then I'll join you."
While this was nothing for most people, I had never seen her in a towel in front of company before. And she was standing basically right next to where I was sitting, facing the room.
Was she really tempting me to do what I thought she was? This was different from being in front of strangers. But when she started to stall, asking Jordan how work had been, I decided.
She must have seen the changes of expression on our friends' faces as they spotted me reaching for her towel. But she didn't react.
I pulled the towel hard, felt the slight resistance of the knot, and then it came right off in one motion.
Becky screamed, and her legs went tight together, buttocks tensed. She covered what she could with her arms but I knew almost all of her breasts must be showing.
Then with no other option, she spun round to get the towel from me, her bare rear facing the guys. Giggling, I held onto the towel, and she was grinning, using both hands to fight.
The front of her was totally exposed to me, her breasts bouncing madly as she struggled. I let go after a few seconds and she pulled it around herself and ran out of the room.
The guys were laughing in astonishment.
I left to check on Becky, but lingered outside the living room for a moment.
"That was amazing," Jordan was saying.
"Yeah," said Billy. "I mean, I feel bad for her. But we finally got to see."
I went into her room without knocking. She squealed, turning in fright, a hand cupping each of her breasts. She already had a long skirt on.
"Close the door, for God's sake."
I did, and she lowered her arms. I watched as she put on her bra, and noticed that it was much fancier than the one she'd had on earlier. I wondered what panties she was wearing.
"Was that what you wanted?" I asked.
"No, it wasn't. I just want to show... Well, I don't know. Just a towel, I guess."
"Are you sure? Anyway, the guys are thrilled. I overheard Billy saying that they've been wanting to see what you were hiding for a while."
"Are you serious?" She was grinning. "It's mortifying."
"Jordan said you look amazing."
We fetched some drinks, and went back to the living room. The guys seemed sheepish and I thought it seemed obvious they had been discussing Becky since I'd left. Jordan in particular couldn't keep his eyes off her.
Becky seemed more animated than usual. She was quick to laugh, and drinking a lot. Eventually, I had to turn the conversation to what had happened.