Enjoy the new sensation

You grab Steffi's hand for an instance as it rests on your hard dick, pondering on whether you should push it away or not. "Fuck it, I don't know when a chance like that will present itself again, might as well enjoy it", you think as you release her hand from your grip and she immediately starts to jerk you off again.

You try your best to control your breathing and act as normally as possible, so that you do not arouse the suspicion of the packed classroom. The situation is very uncomfortable, but strangely erotic.

Even though Steffi's hand isn't in direct contact with your dick, you can still feel each and every one of her movement. The new sensation quickly brings you close to orgasm, as your breathing becomes ragged and your cock begins to pulse.

Just then, she slips her hand into your pants and gives you a few quick strokes. You always thought a handjob would feel just like jerking off, but the feeling of Steffi's hand working on your shaft is incredible, with every motion feeling surprising and unexpected. This extra stimulation is enough to push you over the edge. You involuntarily let out a groan, which you quickly disguise as a cough. A few heads turn in your direction, but thankfully nobody seems to notice what is happening under the table.

You close your eyes and feel yourself shooting ropes after ropes of semen into your pants for a solid 30 seconds, until finally your orgasm subsides.

By the time you manage to compose yourself again, the lecture is coming to an end. "Seems like I'll have to review everything by myself later", you think. You turn to Steffi to talk about what just happened, but to your surprise, she is already up and going towards the exit door.