Chapter 10: Mama loves my thick cock

"Yes baby, yes, cum for mama, mmghh, I love this," Crystabel kept moaning as she rubbed my cock against her slimy wet pussy.

And just as she said she would, she came multiple times in one session. It was ecstatic. With how much cum left her pussy every second, I felt an overwhelming sense of pleasure, something I had almost never felt before. Thanks to the help of the card I was able to cum more than three times as well. And I must say my step sister was really horny, but with how much we came today I do not think she would be masturbating for days.

’Yes yes, I am thoroughly satisfied by big brother’s long thick cock. Despite not even getting it in I knew it was worth it,’ she said as she rubbed my cock around her overly soaked pussy in a slower rhythm this time, since we had already come to her satisfaction. But even then the slow movement still managed to get us one more round of pleasure before finally stopping. I am sure both of us were genuinely exhausted by the whole ordeal.

Without wasting much time she immediately cleaned up the environment and finally took off my blindfold.

"Thank you so much, step sis. I feel much better now. You are really the best."

[Congratulations. Mission has been completed. New skill has been unlocked: Perverted Ranking System. You can now see a rank above everyone’s head at will. This rank represents how perverted they are, helping you gauge how you would go about corrupting and bending them to your own perverted wish. Keep completing missions and gaining skills just like this. The more perverted missions you complete, the better the rewards. That being said, you have also been rewarded with 1300 system coins to shop for whatever item you might need in the perverted store.]

Looking at the system message I was genuinely pleased. It seemed like the system had a personality with the way it structured its words. Without hesitation I immediately decided to start using the ranking right away. And my first target was obviously my step sister. Yes, the one that had just made me cum more than six times. Yes, the one fucking herself with her step sister’s panties just because her step brother’s semen was on it. But now let us see just how perverted she was.

I looked right at her forehead and internally spoke the commands.

[Congratulations on using the perverted grading skill for the first time. Here are the other grades.

Rank | Classification

F-Rank: Innocent Mind

E-Rank: Curious Thinker

D-Rank: Secretly Shameless

C-Rank: Hidden Degenerate

B-Rank: Shameless Imagination

A-Rank: Legendary Degenerate

S-Rank: Walking Scandal

SS-Rank: Shameless Monster

SSS-Rank: Primordial Pervert

Your step sister is an A-ranked pervert. She gets so horny at night she masturbates to your name more than three times. In her lifetime she has watched 2478 porn videos. 1235 of them have the male lead’s name called Steven. She has masturbated over a thousand times, and with so much stamina and with how horny she is it would not take long for her to break into S. She has also watched blue films for more than 41 hours. Despite studying in med school her whole life revolves around you and how to get you to suck and fuck her leaking pussy. This is a brief overview of the rank of your step sister Crystabel.]

I could only stare at the screen in shock. Not by how perverted she was, but by how detailed the information was. This was not merely going to be a really perverted feature to add to my bank. It would also help me actively pervert other students apart from my sisters.

"Are you listening to me?" my sister shouted in front of me, snapping me back to reality.

"Is there anything wrong with my head?" she said, turning to the wall mirror to look at her appearance.

"No, there is nothing wrong with your head. I was just lost in thought," I said with a light chuckle.

’Alright, when is he coming next... mmhh, I would make it on Wednesday. At least I am not too busy, and this time it has to be midnight so we can have a lot of time to ourselves.’

’But this time around I really need to fuck him so bad. My pussy would be a mess if I did not.’

"Okay, so I have good news and bad news. First the bad news is your case is a little bad, but the good news is I can help you. I just need you coming every two days for treatment," Crystabel said, acting out her part so well I almost laughed out loud. But I really could not blame her. I mean, who would not be ecstatic after such a fun event.

"It is alright, sis. I would be fully compliant. Anything to get me back to peak health," I said with a slight sadness to my tone.

’He is falling for it. How nice. I can feel the dopamine rush. He is very naive, but I do not care. My step brother has always been a pervert, and just helping him fulfill his dreams. Do not worry, big brother. I would fuck you so much that you would lose your brain cells.’

Now that was how I liked it, except that she did not know it was I who was doing the perverting.

"Do not worry. No need to worry yourself too much, okay? We would get past this. All I need from you is three things. One, do not tell anybody about this encounter. The disease you have is so bad that people would start treating you bad, even Mom and Dad."

I immediately pretended to be shocked and saddened by my "predicament."

"Second, take these drugs. Drink three tablets on wednesday by exactly 11:30 p.m. and then come over here by 12:00, and that way we would be able to get the most fluid out."

’Except that the pills were stimulants, to make you irresistible by the time I move my pussy close to that huge cock. Do not worry, big brother. Step sis is always here to satisfy your perverted horny feeling, whether you are aware or not. That is what a perverted big sister should do.’