She gets fucked, hard, and the intern is to watch.

Evelyn, the intern, and big boy all enter the cramped quarters just off of the medical lab. The furnishing are sparse. Just a twin bed, a dresser built into the wall and a chair. Evelyn pushes the intern into the chair and gives him instructions to take careful notes and to listen to everything she says. She then removes what little clothing she is wearing and lays down on the bed facing the intern. She takes two fingers, pushes her lips apart and shows the intern the soft pink interior of her pussy.

"Intern please observe my vaginal opening. Would you describe it as particularly dilated?"

"No mam, it...it appears normal"

"Interesting. Usually it would be dilated post coitus, although I guess what we did was hardly sex. I'm about to have subject 101 initiate intercourse with me. Please pay attention. I think it'll be...quite infromative".

Evelyn's eyes move off the intern and over to where Big boy is standing and quickly focus on his monstrous appendage as it bobs up and down infront of him, flicking precum into the air. She licks her lips and beckons him over with her finger and says "Come here Big boy it's time to give Mama what she needs"

Big boy approaches and then settles onto the bed. It groans beneath his weight. Evelyn let's one leg drop off the side of the bed so her glistening slit and Big boys cock are clearly visible to the intern. She then takes the other one and lifts it up offering it to big boy to hold. He does. Evelyn smiles up at big boy before she turns her eyes back to the intern.

"Take a note" she says, "Subject 101's phallus is extremely large. It covers the entirety of Dr.St.Clair's torso. It gives off a strong scent which she finds intoxicating. Subject 101 also produces copious amounts of pre-ejaculatory fluid. It's taste is pungent, salty, and fizzes on the tongue when ingested. It has aphrodisiac properties and excites females in preparation for mating".

Evelyn then looks back up at Big boy and says "Okay sweet heart, lets slip it in nice and gentle. Mama wants to feel every inch as it goes inside". She grabs his shaft and guides it to her hole. Big boy presses his fat tip between her lips and pops it into her tunnel which spasms as it tries to accommodate his girth. Evelyn throws her head back and let's out a long low moan before she looks at the intern with big wet eyes as he slowly push into her and says "Subject 101 is...ugh.. very large and incredibly thick. He stretches Dr.-Ah!, Dr.St.Clair much more then any of her previous partners. Fuck! It is immensely ugh pleasurable".

Big boy begins to lose his cool as he slides deeper into Evelyn's slick vice like hole and proceeds to pound into her with hard steady strokes. Evelyn's cunt is gushing now and it's becoming hard to speak.

"Subject-ah-really-uh-pounding the shit out of my-uuuuuugh-poor little pussy. I'm ugh losing my mind. Oh Fuck he's so deep. He's-ah-he's-ah- He's so much better than you!"

Her words just turn into a high pitch wail as her whole body convulses. Her juice fly out around the base of big boys cock and she babbles, "Big, big, better, so big..cumcumcum. Give I want, I want, I want!".

Once again Evelyn's spasming quim dancing around his cock forces Big boy to shoot his load. He roars and buries himself to the hilt as Evelyn screams with pleasure. Fluids fly everywhere and Evelyn gasps for breath as Big boy throbs inside her.

Evelyn's head rolls to the side and she once again focuses on the intern who looks utterly defeated and says "In conclusion Subject 101 has proven to be a smashing success and has ruined Dr. St.Clair for all other species, especially little boys who barely make it past her butt cheeks" and laugh as she notices the little tent that the intern has pitched.