Positively

“I appreciate you asking but you really need to take the hint. As long as you don't actually penetrate me then you can do anything you want. Look…” Sarah replied before crossing her legs and firmly wrapping her thighs around your cock and pressing it tighter against her mound.

“Now you can feel even better,” she teased.

You took another few slow thrusts and you had to admit that it felt divine. No longer being held back by your guilty conscience, you began thrusting at a faster steady pace that left you tingling with pleasure. In the spur of the moment, you grabbed Sarah even closer towards you and held her tightly as you slammed your hips against her, causing Sarah to moan in response.

She braced herself against the wall with one arm and moved the other down her body and started playing with her clit. She would have been moaning louder but knowing that Mom and Lucy were only a few rooms away, she bit her lip to stifle them. You were too carried away to worry about anyone but you and Sarah and as both of Sarah's arms were preoccupied, you took it upon yourself to start playing with her tits.

Sarah appreciated the attention and was trying her best to avoid making any noise as you rolled and pinched her nipples between your fingers.

“Oh god” Sarah moaned, getting overwhelmed from the pleasure she was experiencing.

“What's the matter? Is your brother's cock gonna make you cum?” you teased.

Sarah didn't respond but a moan escaped her lips as you kept thrusting against her lips. Her lack of actual response awoke something in you as you bunched her hair up into a ponytail and grabbed the base before pulling her head back. She looked into your eyes with a hint of surprise on her flushed face, still biting her lip to hold herself back.

“I want you to admit it” you ordered.

“Oh fuck, admit what?” she replied, finding it harder to concentrate as she got closer and closer to her climax

“That the dick sliding against your pussy is gonna make you cum”

“Oh, yes. Your slutty sister is gonna cum all over your dick” she moaned as you could feel her tense up.

“Good girl” you whispered, letting your breath run up her neck before replying right next to her ear.

That seemed to be the last straw for her as she bucked against your hips and reverently jammed her hand between her thighs. You felt her gush against your cock and the thought of making your sister cum brought you dangerously close to your own orgasm. In an effort to silence her voice, Sarah went to move the hand bracing herself against the wall towards her mouth but her knees buckled under her as she loosely started to fall.

She leaned against you as you helped her to the floor but even while this was happening, the hand between her legs continued to move as she carried on playing with herself, drawing out the pleasure she was getting. She sat on her knees as she looked up at you to see your erection only inches away from her face. You could tell by the fiery look in her eyes that she wanted you to continue and with you so close to cumming earlier, it didn't take you long until you were past the point of no return. Sensing you were close, Sarah closed her eyes just as the first rope of cum landed across the bridge of her nose.

You slowly lowered your dick in an attempt to aim and managed to get the next few shots along her lips and chin before slowly flowing down her neck and onto her chest. Sarah seemed to reach her peak at the same time and you saw her bite her now cum covered lip in an attempt to quiet down. With the waves of pleasure finally subsiding for the both of you, you decided to crouch down next to her while you caught your breath.

You thought about scooping up the cum off her face with your finger and making her lick it off but she looked worn out already so you decided to skip that for now. You still helped her clean off her face before you helped her up to finish off the shower. You quickly finished cleaning yourself off and jumped out to give her more space to wash.

You spent a few minutes drying yourself and finishing your bathroom routine before passing Sarah a towel for her hair and wrapping another one around her body and patting her dry. You spent a little longer on her ass and chest than necessary which only caused Sarah to grin in response.

“That was pretty intense huh” she admitted, letting you run the towel over every part of her body.

“You could say that again. I think that's the biggest load you’ve coaxed out of me so far” you replied grinning to yourself.

“I wasn't expecting the dirty talk either. It was… surprising” she quietly murmured.

“Surprising in a good way or a bad way” you questioned, finishing off your patting of her body that had become unnecessary by this point

“Definitely a good way” Sarah cheerfully answered no longer caring about her nudity around you. “And when you pulled my head back, I thought I was gonna pass out. It was that good. You should take charge like that more often.”

You were continually getting surprised by how effective the KDK was at amplifying peoples behaviour, and watched your sister get giddy at the thought of you controlling her.

“You really like being used don’t you?” you rhetorically asked.

“It's amazing” she happily answered. “Like I said earlier, something clicked this week and I don't think I want to go back. I should have invited you to shower with me ages ago”

“Well if you be a good girl, then maybe I’ll join you again. But only if you ask nicely.” you replied, pointing your finger at her and acting as Mom did in her usual lectures. Surprisingly that only made Sarah smile even more.

“Deal! No take-backs” she beamed before almost rushing out the room so you couldn't go back on your word. She grabbed her clothes and the towel out of your hands and unwedged the door before checking the coast was clear and heading to her room. You waited to hear her bedroom door shut, just in case anyone saw the two of you leave at the same time, before wrapping a towel around your waist and grabbing your own clothes and walking out of the room.

Nobody came out to interrupt you but you could hear the sounds of the TV in the living room so you knew either Mom or Lucy were now up and about. With the sound of the shower running in the bathroom, it was unlikely that they could have heard what you and Sarah were doing but to be on the safe side you decided to try and sneak out and over to Emma’s to give yourself an alibi.

You were about to put your clothes in the washing bin when you realised something wasn't quite right.