When my dick is held at a vertical angle, it becomes super sensitive... My dick is held tightly by the warm stockings that were clinging to my sister's ass and thighs until a moment ago, and she continues to suck it with her erotic mouth without using her hands. Unlike being held in place by her hands, this blowjob lets you directly feel the mucous membranes of her mouth (the softness of her lips, the warmth of her cheeks, the slippery tongue, the movement of her saliva...)!