The knob end.

Alexandra looked at the thing in Krista's hand. Her tutor had always said "Do what it takes;" she was going to follow that advice with gusto and go for the bonus marks.

"The knob, please." She undid the top two buttons of her shirt.

"What was that for?"

"Someplace to hold it while I get ready." She took the crystal dildo and slid the smooth end between her C-cups so that it stuck out like an ice cream cone. Then she leaned her head down and took the knob into her mouth, sucking it and caressing with her tongue. The smooth slick crystal made her wet just feeling it between her lips; but those weren't the lips it was meant for.

Alexandra slowly unfastened her skirt and let it drop. Her natural sheer panty-hose came next, slowly gliding down her legs until they were bunched at her ankles. Her panties followed.

"Do you like what you see, Miss Krista?"

Krista would not admit it, but this was getting her hot. Maybe forcing the nubile young girl to do this wasn't what she really wanted, especially since no humiliation was involved.

Alexandra hoisted herself onto the desk and lay back on the Speegleman file. She tugged sideways on the crystal, uncovering her left nipple, then slid the crystal down and started rubbing her rapidly-engorging clit with it.

"This feels really nice, Miss Krista, but that's not the show you're looking for, is it?"

"You little whore..."

"Ooh, I like that! Fuck me Krista, fuck me now!"

Alexandra moved the knobbed head down and pressed it against her inner labia. They parted wetly and the tip slid in, then the shaft, until the whole thing was inside her. She let out a loud "Oh, yeah!" and pushed out the tip and then half the length using her vaginal muscles. She used two fingers to slowly push it back in, then let her muscles push it out again.

She smiled impishly at her boss, "You push it in, Miss Krista."

Krista reached forward and pushed, fascinated by this girl who had totally submitted with just one command. The girl's loud exuberant moans were getting her soaking wet. When the end came out the third time she grabbed it.

"God that's wonderful! I can't wait to taste it!"

"That's how I can take control," Krista thought. She took the end of the shaft between her lips and thrust forward until her lips touched the girl's. She savoured the sweet taste and pulled out as Alexandra pushed.

The two played tug-of-war for several strokes, Alexandra teasing her clit with her fingers all the while. Krista felt the girl's muscles clench.

The girl screamed out, "I'm coming, Miss Krista! I'm coming hard!"

Krista took a blast of cum in her face, the girl's jizz flowing around her lips and spattering on her cheeks and chin. The door opened behind her. She whirled and stared at Mr. Dayton, the senior partner. Her face turned hot and red as she felt the drips of cum slowly oozing downward and stared into Mr. Dayton's stern face.