During a nice, relaxing day at the beach, Saber asked Rin if she could help bury her in the sand in the shape of a Mermaid. Which, of course, meant that only her torso and lower body would be covered, leaving her arms and hands out so that she could freely use them for making cute poses for photos. However, Rin had other ideas. She covered Saber up from her neck all the way down to her ankles, leaving only her head and feet exposed.
''Hey, Rin?'' said Saber. ''I thought you were going to bury me like a Mermaid? You were supposed to cover my feet up, silly. Not my arms. Also, you've buried me so deep in here that I can't even move!''
Rin then bent down towards Saber's vulnerable, bare soles and looked over to her. She smirked for a brief moment before pulling a pair of feathers that she had secretly packed into her bag, and held them up for Saber to see her twirl them around between her fingers.
''Um, Rin. What's with the feathers? Saber asked in a concerned manner.
''Remember the other night when you decided to lightly scratch my foot because you thought that I was fast asleep? Well, unfortunately for you, I wasn't! However, that still doesn't mean that I don't want to get my revenge on you. So, I guess it's payback time!'' she replied and began to slowly move the feathers down towards Saber's feet.
''N-No, please! Rin! I-I'm sorry!'' Saber cried out.
It's too late now, Saber. You're not going anywhere, and your pretty soles are all mine! So, then. Let's see how they hold up against my magical, extra soft feathers now, shall we?''