Incest Seduction/Grope Kim's tits through her bra
Trying not to think too much about what you're about to do, you allow your hand to continue moving onto the lacy fabric. Your hand rises gently as it scales her modest chest. With your hand easily enveloping one of your sister's tits, you squeeze slowly and softly, waiting for her to freak out at any moment. Her lace bra isn't padded, which surprises you. You've heard Dawn tease her about that before. But you barely even notice the lace. In fact your fingers tease out far more detail regarding the contours of Kim's young teenage tits than you could have imagined. They are small but pillowy soft. You notice a petite nipple poking into your palm as you squeeze a second time.
With all of your brain power focused on your fingertips, it takes you a moment before you fully comprehend the scene in front of you. Your little sister is sprawled in your lap. You look down the length of your arm until it disappears underneath her shirt. Her midriff is completely exposed. It's weird to see your hand actually under your sister's clothing.
Kim looks extremely tense. Her limbs are frozen. Her breathing is so shallow she may as well be holding her breath. Is it sexual tension? Or something else? Only one way to find out...