Over the knee.

Jenny sits on the couch next to her sister and grabs her, quickly pulling Kim over her lap. Kim protests, kicking her legs and screaming at her sister angrily. Her screaming is quickly punctuated by a yelp as Jenny's hand comes down on Kim's skirt-covered behind with a loud slap. Kim is stunned untill another slap wakes her from her daze, and causes her to yelp again. Her protest begins anew, kicking her legs and yelling "You can't do this to me!" This continues for 6 more swats untill Jenny pauses to lift her sister's skirt.

"What do you think you're doing?" demands Kim.

"What do you think I'm doing?" replies Jenny, "I'm giving you a spanking!"

Kim lets out a nervous chuckle, as she looks at the serious expression on her sister's face. "C'mon Jen, this has gone far enough," She says hoping this is a joke, "I've learned my lesson, really!"

Jenny shakes her head as she pulls Kim's skirt up around her waist, revealing Kim's black lacey panties. "No way Kimmy," Jenny says sternly, "you're not talking your way out of this. This is for real!"

With that, Jenny raises her hand again, eliciting a cry of "No!" from Kim as Jenny brings it down upon Kim's panties which offer little protection to her already pinkened behind. Jenny continues spanking her sister, quickly reducing her to tears in her humiliated state. After 10 swats, Jenny pauses again. Kim thinks that this awful experiance is over when she feels Jenny's finger tips slipping beneath the waistband of her panties.

Kim swings her red, tear-streaked face around, looking at her sister over her shoulder. "Please Jenny! No!" She pleads, but Jenny ignores her as she tugs at the sides of the black lace panties, pulling them down to Kim's knees. Jenny looks down at her work for a moment, and smiles proudly. Kim's bottom is bright red, and jiggles just a bit as Kim shifts about on Jenny's lap uncomfortably. She can even see Kim's shaved privates peeking out from between the base of her heated cheeks.

Kim sees her sister's smile and is a bit scared, pleading again, "Please Jenny, stop! Please!" Jenny's smile quickly disappears, replaces by a stern look as she raises her hand again, bringing it down upon Kims now nude bottom. Kim squeels as the assult on her rear resumes. Jenny spanks her sister's bared behind, moving up and down, alternating cheeks, leaving momentary white hand prints where her blows land. Jenny continues for quite some time, gleefully watching as her sister's firm behind jumps on her lap, stopping only after her hand begins to hurt. She sits there with her hand still resting on Kim's crimson backside feeling the heat rise off of it.