You didn't think I was looking, but you were wrong. I saw it all, you flirting with my sister. Again. I don't even care that you did it, it's that you tried to hide it from me. You glanced around to make sure I wasn't looking, but I could see you in the mirror above the fireplace. Leaning in close to her, your hands on her, that hug that lasted too long.
I know why you do it, she's like a bigger version of me. On the edge of being heavy, but with huge, soft tits and a big round ass. I bet your cock was hard as you leaned in close to her. I wondered if it would still be hard after we get home, because I'm going to punish your balls. It's always more fun when your cock is hard. I'll make it my goal to beat that erection off of you. It's like my own little contest. One that you will lose, even if I don't win.
We walk into our apartment, you don't know you're in trouble yet. You'll soon figure it out, if not from my tone of voice, then from what I do to you. We stop in the living room, and I turn to you.
"Take your clothes off."
You look confused, but you know better than to ask why. You strip quickly, piling your clothes neatly on the bureau. Your cock is hard, as usual. You're hoping for something that won't be happening. You think maybe I'm going to play with you, but you're wrong. This is just about punishment. You stand naked in front of me, your legs apart, waiting for what comes next.
"I saw you with my sister, sneaking around and getting all handsy with her."
"What do you mean?"
"You know," I said sternly. "This isn't the first time."
You try to look innocent, but you're walking a fine line. You don't want to make me any more angry, you know better than that.
"I ... uh ... I'm sorry."
"Yes, you will be."
You suddenly looked scared, because I can be brutal when I'm angry. Shit, I'm brutal when I'm not angry.
"Are you ... going to punish me?"
"Yes."
You know what that means, I'm going to kick you in the balls. Over and over. If you fall to the floor, then I'll stomp on them. You know your balls are fucked, and yet your cock is still rock hard. You're such a fucking mess. You look at my feet, noticing the white Keds I'm wearing. At least they aren't boots, right? Or pointy-toed shoes. It won't matter what they are, because I'm going to pummel your balls either way. Now.
I turn towards you, and the look of fear crosses your face. I take a step in your direction, then I send my foot careening into your balls. The loud thud reverberates throughout our living room. Your face registers shock as the pain hits you. Your hands quickly grab your balls, and you bend forward.
"Stand up, and hands off!" I order.
You have to comply, otherwise, I will destroy your balls. I'll stomp them into little bloody pancakes. You pull your hands away and try to stand. Your legs are shaking, and yet your cock is still rock hard. That annoys me, I step into it, trying to kick that erection right off of you.
"FUCK!" you grunt as my foot smashes into your balls. Your mouth forms an O shape, you gasp for breath, then you drop to the floor. I nailed you, you have nothing left. Your legs don't work, you can't breathe. Only your erection remains.
You lay on the living room floor, curled up in a fetal position, clutching your aching balls. I did that to you, I put you on the floor. My pussy is tingling, but I have other plans for you this night. On cue, the front doorbell rings, I go to let my sister in. The two of us come back to find you on your hands and knees, trying to stand again. Your red balls look like tree ornaments as we walk into the room. We both laugh.
We watch you as you struggle to stand, then my sister walks up to you. She puts her hand on your cock, and she strokes you slowly. You moan and look at her with a mix of lust and confusion. She leans in close to you and speaks just above a whisper.
"I can't believe you still try to flirt with me. Won't you ever learn?" Her hand continues stroking your hard cock. You're pushing into her hand, you look like you might actually orgasm. What a fool.
"My sister and I are very close," she says as she tugs on your cock, bringing you closer to her. Her knee shoots up between your legs, crunching into your balls. You grunt and nearly fall into her, just barely able to stay standing.
"We wouldn't let you come between us, would we?" Her knee found your balls again, you fall onto her this time, your head landing on those breasts you so desire. She still holds your hard cock, she tugs on it.
"NO!" you croak as your cock betrays you, shooting a rope of cum onto her. "FUCK!" My sister and I both laugh as your cock starts spewing cum all over the two of you. She rams her knee into your balls again, sending a rope of cum into your hair. Another knee and another. You want to drop to the floor, to hide and curl up, but you also want your cock in her hand as she strokes the rest of the cum from your aching balls.
You cum for another minute, then you finally drop to the carpet and curl up like a baby. Your balls are hanging out behind you, my sister spots them and draws her foot back, then snaps it into them with a loud thud. You grunt and reach to cup them in your shaking hand.
My sister and I laugh at you as we walk to the door. I give her a big hug and thank her for helping me discipline you. She's always happy to help.