Pussy

Negi, using all his willpower to stay focused mumbled "Quis adveho, reservo" and his orgasm stopped. Or paused, more accurately. He still felt like he was about to cum, but he didn't. Ayaka didn't seem to notice or if she did, she didn't care. Having her pussy pumped by her teacher was the only thing on her mind. She was so close to cumming all over his dick, and somehow, Negi knew it, despite never even having watched porn. He decided to give Ayaka an orgasm she would never forget.

Negi, muttering: Quis adveho , adveho per rabies.

The instant he finished the spell, Ayaka's knees buckled and she screamed as the most intense orgasm ever witnessed by man tore through her from pussy to brain and back again. Her vision went dark and for a second she was technically ****.

Negi: Maybe I shouldn't have used a word as strong as 'rabies'.

When Ayaka regained consciousness, she was delighted to find Negi still fucking her, and she immediately returned to near-climax.

Ayaka: Negiiii...!!! I'm gonna cum again!

Negi: Not bad for a first-timer, eh?

Ayaka: Oh, Negi! You're such a great fuck! Please, will you cum with me?!

Negi: Yes, if that's what you want.

Ayaka: It is! I want you to cum in me!

Negi: I can't do that! What if you get....(thinking) Wait, I have a spell for that, don't I? I'm sure I do. (out loud) You want it inside you? Well then that's where you're getting it!

Ayaka: Yes! Oh, thank you, professor Negi Springfield!! (thinking) When I have Negi's baby, that'll make sure he's mine for good! (out loud) Cum in me, Negi! Make me your own personal cum-slut!!

[Note: 'quis adveho, reservo' means 'what comes, stay back'. 'Quis adveho , adveho per rabies' means' what comes, come with fury'.