The evening was weird, everybody was polite, but the conversation never seemed to get going at dinner, Sky did not feel like talking to either of them so was more than happy with that, but the chat between Rob and Lily was not normal either.
Sky was not getting involved, the last thing she needed was a reason for more punishment, and so she kept her head down, but offered to clear everything up after dinner, that kept her out of the way, and should create brownie points to go against punishment too.
She had all but finished cleaning up, just about to wipe down the worktops, when she was called from the living room, she had heard hushed tones coming from there but this was an instruction.
'Sky come attend to your Mistress,' Lily shouted.
Sky felt sick, 'oh god what is going to have me do now', she thought, Sky put down the cloth and walked into the living room.
'Yes Mistress, how can I serve you,' Sky said as meekly as she was able, but she thought it sounded more resigned.
'Sound happier girl,' her sister said, 'All I want to know is, what did Rob do to you this afternoon.'
Sky blushed, she was not good at talking about anything sexual, but she took a deep breath.
'He gave me lashes,' she looked at Rob who looked pissed off, 'very hard ones, master,' she continued, 'then he used a strap-on dildo on my arse, which was painful, master. That was all he did mistress,' she concluded
'Thank you, Sky,' said Lily, 'and did he say why he used the strap-on?'
'He said I lost him a bet, and that it was being used on him tonight, and so I was getting it first, mistress,' Sky said wishing not to be part of this conversation. After a moment she add, 'Oh and Mistress, he said to prepare for more punishment tonight.'
'Did he...' Lily mused, but continued before Sky could say anything else, 'Well that was presumptuous of him, and he probably presumed I would not find out about the strap-on. He was not supposed to use that on you, and that means a special treat for you tonight, you get to be part of his punishment.'
'Thank you Mistress,' Sky said, not feeling happy about that at all, 'May I do back to finish the kitchen now?'
'Yes, off you go.'
Sky went back and finished the kitchen quickly, then disappeared to her room.
She must have fallen asleep, because the next thing she knew there were sounds like the cane from earlier, and she heard what she thought was Rob grunting. After a moment she listened to Lily's voice.
The sound carried through, 'You are such a worm and I clearly have not done this enough, how dare you deviate from the punishment I tell you to give her, and what is the crying out? That is 5 you have 25 to take, and you only have yourself to blame.'
Then she heard Rob again, 'Yes Mistress, I am sorry Mistress, I deserve these 25 for violating Sky.'
Sky listened to the sound of the cane swishing through the air and the whack as it hit Rob's arse, followed by his half suppressed grunt, which was so hot, she slipped her hand down her trousers and rubbed.
Lily was clearly taking her time, these were not close together, there was a pause between each one, Sky imagined the image, Rob standing the way he made her stand, taking the cane, although she was sure they were in their bedroom, so his hands would have to be on the bed.
Sky revelled in that sound, she imagined being the one striking Rob, she had never been into that, but he had pushed her to the point where the thought of doing it to him turned her on, sweet revenge. She rubbed her clit with a ferocity that reflected what she was hearing her mind away imagining the scene next door. Sky was surprised how quickly she felt the feeling rise the warmth in her pussy spreading to her clit, she quickly got to the point of no return, and shuddered as she climaxed. She must have made noise, because the next thing she heard was Lily calling her.
'Sky, remove your clothes and come in here,' there was no misreading that was a command.
