Cas adjusted Jenny’s position, so her bottom was the highest point, trying to get used to the feeling of his little sister over his lap. Forcing himself to keep going, he flipped up the back of her skirt and tucked it up at her waistband, gently tugging her panties the rest of the way down to her knees. He’d gone over his Dad’s lap almost more times than he could count, and he’d gone over James’ lap more than his fair share of times too, he’d even taken a couple trips over Lily’s lap when she’d felt the need to swat some sense into him, and despite being already sixteen when Sirius had become his legal guardian he’d not been spared the occasional trip over his lap when he’d stepped over the line. He had heaps of experience being on the receiving end, but this was the first time he’d had to give a spanking.