Jack watched in anticipation as his cock disappeared into Miranda's mouth. When about half of him was inside her, he felt his tip press against a constriction. She closed her eyes and made a strange expression, then stuck out her tongue further and pushed. He felt increasing pressure push against his cock until suddenly he felt a wonderful tightness wrap around his cock as it disappeared entirely into her mouth, and nose press against his stomach.
The sensation of her throat squeezing his cock was so intense that he knew he was going to finish in the next few seconds. He could already feel pressure building in his balls.