Cum in her (She learns a lesson about spellcraft)

You pound into her pussy, so warm and tight, you are in heaven. The warm wet tightness fills your brain with static and you can't help yourself but ride hard into the fine filly beneath you. She struggles and squirms, stimulating you with each movement, you moan telling her you love her as you thrust in hard and start to cum, you feel the ropes of seed fill her body the flared head of your cock pressing your seed deeper with each uncontrolled thrust.

You start to shrink out of her your hips still thrusting and she is smiling and giggling under you "sweet celestia mack you are amazing, I didn't think you would get my role playing at first but I am glad you did." You shake the fuzz out of your head "Um... what?" she wiggles her hips pleasantly "oh, you know, even though i was using a contraception spell telling you not to cum inside like you could get me pregnant." You sigh in relief "oh, I thought I heard you say something but I was too into it to stop." she giggles again and her pussy clamps pushing your now soft member out along with a dribble of thick cum.

Looking down at her pussy as you fall out she gasps and runs upstairs "oh no, how did this happen? I need my books!"