No

"I just was so embarrassed Tammy... I thought of my favorite dirty video so I would cum quickly and you would let me out."

"Hmmm..." Tammy looks at you quizzically "... you didn't complete the experiment in a fair manner then!" She presses the button on her remote that puts you back down on all fours, your face centimeters from the pool of your cum.

"MATILDA... can you come back down please?" Tammy shouts

Matilda come back into the garage to see you back on all fours. "What's up?"

"Well sis, it would appear that Sam here has cum quickly on purpose thus skewing the results of your experiment."

"Saaaammm..." a disappointed Matilda utters "... whyyyyyy?"

You don't answer, weirdly feeling that despite your humiliation you have let the McKenzie sisters down.

"Sam, you've upset my sister" Tammy says "I can't let that go unpunished!"

"What do you mean?" you try to protest as you see Tammy whisper to Matilda. Matilda giggles and runs off out of the garage.

"We don't like dishonesty Sam. You're going to regret trying to cheat us."

"Tammy, please, I'm sorry. I'll do the experiment properly this time."

"Too late Sam" screams Matilda as she re-enters the garage with the camera and a backpack.