Erectus Controllum!

The Blowjob Throne held many secrets... one of them being the knowledge of ancient spells, long lost since the rise of the human empires. These were spells that were hidden within the most ancient Elven empires and seemingly forgotten. The magic was potent and you didn't have the opportunity to use it that often... but this time seemed like a good time to finally test one particular spell you had been studying since the throne's discovery. You raise your middle finger up in a straight line and draw triangle in mid-air at the end of it and exclaim...

"ERECTUS CONTROLLUM!"

The would be assassin's drop their weapons and slow to a halt. They have a dazed look about them. It seems like the spell worked.

Marjolaine looked peeved, "what is wrong with you two?! Kill him!", she commanded.

The two would-be assassins turn around back to her. The front of their pants protruded out grotesquely, their erections very visible to the thieving bard. They rushed towards her with a blank look on their faces and the woman looked quite shocked.

"What have you done?!", she asks.

"Just a little trick I picked on my travels", you reply with a smirk.

She attempts to fight back but the strong assassins she had hired quickly overpower her. With her arms subdued, the assassins thrusted their bulges against her face. It's as if they were trying to fuck her face but not understanding how. The clothed tips of their turgid cocks stabbed against her cheeks with every thrust.

"Let me go you imbeciles! You're being controlled", she exclaims.

The two men wouldn't listen, continually slapping and thrusting their bulges against her head area while under the influence of your spell. Her head was like a ping-pong ball, being bounced against their crotches as she continually tried to free herself. Not bad for a first-time spell casting! You were worried they were going to explode or some such.

You strode forward towards her, cock already exposed and ready to fuck.