"I... Um," Naruto's blush reached his neck, "Shizune, please don't make me say tha-" He stopped mid-sentence, panicing as she sighed and began to move away, shaking her head in dispointment, "Wait!" He called; Shizune turned, her gaze dark penetrating, "I'm a premature ejaculator!"
He almost shouted those words, and the older kunoichi giggled to hear the desperate humilation in his voice.
"That's all you had to say," She spoke soothingly, gently grasping his erect cock again, "All we need is honesty. Hon-e-sty," She shuttled her hand up and down with every syllable, and the crown of his head began to weep again. She licked her lips, raising her gaze from his pulsing penis to his big blue eyes. There they stared, locked, and she watched his face twist and turn in pleasure.
He began to hump into her fist, thrusting like a dog. Shizune pulled them close; he could feel her hot breath by his ear - for she was the taller - and her bosom upon his chest, "Let it all out, Naruto-kun," She whispered, adding spitefully, "My little premature ejaculator; let out your little premature spurts,"
Naruto shuddered to hear those words, and his breath hitched, his hips thrust, and his breath became a moan. His cock pulsed again in Shizune's hand, and she wrenched at his erect rod, masturbating the younger boy at a furious pace. He came suddenly, his eyes still locked on hers, his cock pulsing, making pearly white trails in the air. "Good boy," She said, amazed; there was nothing little about his ejaculation. He had let loose at least five spurts, "That's all nurse Shizune needs, Naruto cumming like the good little ninja he is,"
He was too tired to be embarassed; he leaned into Shizune's neck, feeling her pleasant heat, and there he rested.