Not so fast

Before she could get up off your lap, you held her waist to stop her from moving away. You knew that Lucy would be off doing whatever it was that she came downstairs for, so you considered yourself lucky to have an extra minute or two alone with Mom. She didn’t seem angry that you had prevented her from leaving but she continued to look nervously at the door in case Lucy returned.

“Trust me it's gonna be fine, how about one last kiss before I go?” you asked, bringing her attention back to you with a squeeze of her ass.

Her eyes were still nervously flicking towards the door but she knew you weren’t gonna let her leave until you got what you wanted and the fact that the blush returned to her face so quickly made you think that she hadn’t wanted to be interrupted earlier either. Her face drew towards your own and you embraced her once again. She had moved her body away from you once Lucy left but before you could get your hands on her tits, she wrapped her arms around you and pressed herself up against you.

You enjoyed the next few minutes knowing that Mom was clearly enjoying herself and although you wanted to carry on doing this and more for the rest of the evening, you needed to do some damage control with your sister. Mom seemed to be off in her own world as she continued to kiss you and with you needing to get up, you tried to shock her out of it by giving her a quick spank. Your hands were already all over her ass so you only lightly pulled them back before taking a swipe at one of her cheeks.

That seemed to do the trick as she wrapped up the kiss to look at you but the fiery look in her eyes almost made you want to double down on attacking her. It took a lot more willpower than you thought you would have in this type of situation but you managed to take a deep breath and calm yourself down.

“I would really love to carry on doing this but I think we both know that it would be a bad idea if Lucy saw us again” you sighed, patting her ass as a sign for her to get up off of your lap that had been her seat for the past several minutes. She took the hint and shimmied off you before sitting down on the couch to your side. You had no idea how much time if any was left on her 30-minute active effect but if there was still time left, the effect would start reaching its peak after you left the room.

“I’m gonna wait to follow Lucy upstairs but if you need to ‘take care’ of yourself then your free to do so” you suggested getting a quizzical look from Mom.

“I don’t get what you mean” Mom replied still looking confused, making you smile at how naive she could be when it came to stuff like this.

“Well, if you need to make use of the 3rd rule that we agreed on yesterday, then nobody would blame you” you responded, watching the dots connect together in her brain before she replied.

“I’m not gonna do that! I mean…” she protested, raising her voice before you silenced her with a finger on her lips.

“There's no point denying it at this point but if you are gonna play it like that then fine. I’ll make sure Lucy definitely comes upstairs with me so you won’t get interrupted” you replied, cutting her off before she could deny anything.

You got up before she could say anything else and gave her a quick peck on the forehead, leaving your mother still looking dazed as she sat half-naked on the sofa. You spotted that the wet patch on her panties had gotten bigger but you felt like you had already embarrassed her enough and headed for the door.

You hadn’t expected this evening to go like this but you had no complaints so far. Lucy catching you and Mom was slightly touch and go but you had managed to make your way through that without much trouble. You waited outside the living room as you waited for Lucy to pop back up, keeping the door closed behind you in case anyone tried to take a sneak peak inside. It didn’t take long for Lucy to return from the kitchen, holding a fresh glass of juice that you assumed she had come down for in the first place. She looked at you suspiciously when she saw you but when she realised you were following her upstairs, she started listing off her grievances.

“If you think I’m gonna believe for a second that it was just an innocent kiss between the two of you, then you’ve got another thing coming” Lucy huffed, poking you on the chest with her free hand once you got to the top of the stairs.

“Why? You jealous?” you asked, giving her the biggest shit-eating grin you could manage.

“Ha, dream on pervert. There’s not a chance in hell that I would be caught kissing you, your my own brother” she retorted, laughing at the absurdity of your question.

“So kissing is a no-go but jacking me off in the shower is perfectly fine?” you queried, watching the ridiculing smile disappear from her face.

“T-that's different, you were the one who barged in on me anyway” she replied, changing the subject to pin the blame on you.

“You should just admit that you have a fetish for cum and get it over with, it would make things so much easier for the both of us” you said, shaking your head as she stormed off towards her room.

If she would stop being in denial about her own kinks then things would probably be a lot smoother between the two of you but in the back of your mind, you couldn’t help but enjoy this little game that the two of you seemed to be playing.

“Wait a sec” you called out, catching up to her just before she closed the door.

“What” she spat back, speaking through clenched teeth.

“I need a new pair of your panties. I gave you the last ones and you haven’t given me a new pair” you declared, getting a tut from her before she slammed the door in your face.

It was your last-ditch effort for you to get her riled up but she seemingly didn’t take the bait. You were about halfway down the corridor contemplating what to do with the rest of your evening when you heard the door open behind you and turned back around. Before you could react, you got hit in the face with something soft and saw Lucy chuckle before she slammed her door once again.

Looking down, you saw that you had caught the pair of panties that had hit you, still feeling warm as you held them in your hands. It seemed that Lucy still wanted you to keep your end of your deal even if she wasn’t willing to admit anything to your face. After that, you had no idea who had come out on top during the exchange but you pocketed her underwear to use at a later time.

You had hoped that you could now go back to the peace and quiet of your room after that but as you got closer, the door to Sarah’s room creaked open and she opened it fully once she saw that it was you.

Author's Note: Spoiler chapter updated shortly for chapter 125