'We'll see,' Sam said with a smirk. 'Go and order two milkshakes, I don't care what flavour, and you can even keep your clothing in order for now. I'll tell you the rest when you get back.'
Sam waited patiently, allowing her heart rate to settle after her previous ordeal, though the thought of what she was going to make Lucy do next made it difficult to stay cool, which she felt was ironic. Simply watching her friend walk in the dress she'd chosen made it difficult to stay cool, in fairness, though. Sam had long considered herself open-minded, curious even, but something about Lucy made her want to put thought into practice.
Whatever it was, Lucy brought it back with her a couple of minutes later when she strutted back to the table along with the two milkshakes.
'Here you go,' Lucy said, putting them both on the table. 'One banana, one strawberry. Take your pick.'
'They're both for you,' Sam replied with a wicked grin.
'What would I want with two whole, large milkshakes?'
'It's your dare. Empty one into your knickers, the other into your bra.'
Lucy looked stunned for a moment. 'Y-you're serious?'
Sam just nodded.
'Oh my God. My underwear can't hold all that,' Lucy laughed. It'll go everywhere!'
'Yep.'
'Sam, come on.'
'We can just say I won if it's too much.'
Lucy paused again, seeming to genuinely consider the prospect. 'Alright,' she said at last. 'Fine. I see how it is. Just remember - you started this.'
'No I didn't. It was your idea!'
'True, but I didn't get you messy. Not yet, anyway.'
Sam laughed now. 'So you were going to get me messy.'
'Well, of course. That's the whole point. But not like this. Not so... obviously.'
'Alright. You've made your point. Now are you going to do it or not?'
'I never knew you were so pushy,' Lucy joked. 'I said I'll do it. Here.' She picked up the banana shake in her right hand, using her left to pull the neckline of her dress even wider than it already was. Sam wasn't shy about enjoying the enhanced view - it was a bit late for being coy after what she'd just done. Lifting the cup, Lucy took a breath, gritted her teeth and upended it all over her chest. The lid immediately fell under the weight of the thick slime within, and yellow gunk splattered pleasingly across her naked flesh.
Lucy let out a high-pitched gasp, then sucked air in through her teeth and gritted them once more. She naturally wanted to gasp and shriek at the cold slime now sloshing around her breasts and down her tummy, but she knew better than to yell out and draw attention to herself. She settled for mouthing several obscenities while alternating between gasps and giggles as semi-melted ice-cream oozed down her stomach. Some pooled around her waist but plenty stayed where Sam had intended - Lucy's impressive, now slippery cleavage.
To the surprise of nobody, but the great enjoyment of Sam, Lucy's nipples were clearly visible now, jutting out through the skimpy, slimy clothing she wore. Lucy noticed Sam looking, but was cut off because she could make any kind of quip. 'Quit stalling,' Sam told her. 'You still have one to go.'
Lucy shot her friend a playful glare, but it was hard to maintain any expression that wasn't some mixture of discomfort and self-depreciating laughter.
'Alright, alright. Hang on.'
Lucy lifted the front of her dress, mimicking Sam's previous ordeal. It didn't take much lifting, thanks to the fact that it barely covered her matching white panties anyway. If anything, Sam enjoyed this view more than the previous one and enjoyed it just as brazenly. It almost seemed like a waste to ruin such pretty underwear - white silky material, edged with sheer lace - but they would look even better filled with milkshake, she knew.
After some understandable hesitation, Lucy poured the second cup and giggled loudly as soon as the slop hit. Sam couldn't blame her. She knew just how it felt, and knew she would have squealed and giggled just as much, if not more. Even Lucy couldn't keep her voice down this time, and attracted several quizzical looks from passers-by. When they looked down to see what she was squealing about, their expressions quickly change to something more like bafflement or, occasionally, excitement.
The knickers, beautiful though they had been, were no match for a large milkshake. They filled and began to sag in no time. About half of the soft ice-cream was oozing down Lucy's thighs and pooling on the floor around her feet. The other half was doing the same, but inside her tights, trapped against her legs and creating a pair of absurd-looking bulges around both of her knees.
'Ah,' interrupted Sam. 'Hold on.'