He kept one hand on the desk, holding a pen as if marking some paper or other and slid the other under the table, running it through his stalker's hair. She'd moved away from his still-hard manhood and nuzzled in under it to suck on his balls. He nearly broke the pen he was holding, and grabbed tightly at her hair, gasping as quietly as he could and thrusting as gently as his raging arousal would let him.
He pulled at her hair, then rubbed his own cock as she continued to tease his balls with her tonger and teeth. His tip was pounding, it couldn't swell anymore and he was desperate to come, but the girl continued to tease and his mind would dwell on the sheer guilt and shame he felt from the whole situation. His back arched and Nozomu almost whimpered slightly, the chair moved but thankfully made no sound, Matoi pushed his legs further apart and wrapped her lips around his penis once again, sucking hard now, and moving faster, her Sensei was coming hard and fast into her mouth.
"AAAAHHhhhh!" Nozomu lost control of his vocal chords as he came, hot and stickily right down the back of Matoi's throat. She swallowed it all, after all, it wouldn't do to leave evidence.
Zetsubou Sensei leaned forward onto his desk, flushed and relieved, one hand still tangled up in the hair of the girl between his thighs.
"Sensei! This is no time to be dreaming!" chirped a voice from the class, as he looked for all the world at this moment as if he was sleeping on the desk... the thought that they must have noticed his squirming until now hadn't even begun to tug at the back of his mind.
"I'm in despair.." Nozomu muttered from the desk, idly sitting still, hoping the glow rising in his face wouldn't show, as his faithful Matoi sat under the desk and re-tied his hakama.