Leaves you uncontrollably horny

Ms. K teaches Erica the spell, and she comes home to find you as a
'test subject'. You don't understand anything about the odd chant that Erica performs, but when she finishes, you feel the effects immediately.

Your cock stiffens to full hardness, and you ache with the desire to fuck Erica right here and now.

More aggressive and confident than you've been in a long time, you press your lips to Erica's and slide your hand into her pants, guiding her to the bed and pressing her down beneath you while she kisses you in return.

You're throbbing with need, and you roughly strip both Erica and yourself, **** to thrust your tiny cock inside of her for the first time.

You miss her slit in your haste however, and the contact with Erica's skin as your cock rubs against it makes you ejaculate immediately.

You let out a gasp of pleasure and frustration as you fail to insert your dick before cumming already, but luckily, despite feeling a little sensitive, your cock is still rock hard, and you mindlessly thrust again, trying to enter Erica's waiting pussy.

You let out a groan as your dick miss again, once again causing you to squirt your load outside of Erica's pussy. The expression on Erica's face changes from arousal to amusement as you cum twice without even managing to get it inside of her.

Your cock hasn't subsided at all though, and you only take a couple seconds to rest before preparing for a more slow and sure entry...

Before you can try again though, you feel Erica's hand reach down to cover her entrance. She smiles at you playfully, opening her mouth to say something.