It took several minutes of just lying next to him for Fearne to get her breath back but when she did she turned and smiled, deciding just how she was going to give Sanford the release he so obviously and desperately needed. Moving down to straddle his legs she grabbed the bottle of lube and place a large dollop right on his head, pushing her palm into it and smearing the clear gel all around. She then traced the line of his foreskin, drawing small circles in the gel. After a few minutes of this she could hear him grunting and panting again so she stopped and took his cock between her curled forefinger and thumb, just below the head. She had a firm grip around him that she knew would be stimulating his frenulum and she began to rhythmically squeeze. Holding for no more than about two seconds at a time she used her free hand to rub his balls and then press against his perineum.
"I've seen how you get when Mistress does this to you Sandy... You can't stand it for long." She taunted him in a sing-song voice as she changed techniques again, drawing her finger down his length then releasing and going back to the top. "Do you prefer down or upstrokes baby?" She didn't wait for an answer, giving him five down strokes followed by five up. "I bet you're just dying to come right now eh? What would you do for me if I let that happen Sanford? What would you do to me if I was to give you the release you so badly need?"
"Anything. Everything." The words were barely louder than a strangled whisper but she heard them and smirked down at his face. A face that was contorted in agony at the feelings she was generating with her surprisingly skilled movement on his cock. The fact it was his sister-sub and not his Mistress was a double-edged sword. The forbidden nature of what she was doing added to his already peaked arousal but he knew that if Mistress ever found out she would be the angriest she'd ever been. Hell she might even take their collars and that was a thought he just couldn't stand. Soon though all conscious thought ceased and he was reduced to a quivering mass of lust, desire, need. His hips moved up to try and force her pace to increase but she merely tutted and tapped his cock-head with her dry hand. He groaned at the extra stimulation and she gave a small smile of surprise.