Oh my. You blush almost as much as Spike at Twilight's suggestion. Now you're starting to see why Spike is so desperate to get out of here. The poor guy is. Being held down against his will while two older girls take advantage of him. Why it's practically,
"Rape! Raaaaaape!" Spike shouts. You're starting to feel very concerned about all this, and you shoot a concerned look at Twilight. She merely shakes her head and smiles. Then, she turns her attention to Spike,
"You know Spike, if you keep struggling you'll get all sweaty and Rarity won't touch you when she shows up later."
He suddenly perks up, "Rarity's coming? You didn't say she was gonna be here!"
You watch in both confusion and arousal, as Spike's tiny prick begins to peek out of his sheathe. He must be very interested in this Rarity. In fact, you recall Twilight talking about her. Which brings to mind the fact that this Rarity is a pony. How perverse this little dragon is, he wants to get with a pony! Then again, the thought sort of intrigues you...
"Now Miss Orange," Twilight's speaking to you again, "Today you've got the responsibility of being our head nurse."
"Head nurse, what does that mean?"
"Oh silly, if you're head nurse that means you give head!" She says, quite plainly.
You blush again, and look over at the bound dragon on the table. Spike's eyes meet yours, and his pupils shrink. You glance down at his waist, and his cock seems to be doing the opposite. You think it's full engorged, but you can't tell, considering how tiny it is.
"Well nurse? Our patient won't wait all day!" Twilight nudges you with her hoof. You glance from Twilight, to Spike, to Twilight again. She gesutres toward him, and you swallow hard. Guess there's nothing else to do but do it.
You lower your head towards his crotch and get a better look at it. You swear it looks just like a tube of lipstick, so you do the best thing you can, and wrap your lips around it. It has an odd, rubbery texture, unlike any stallion's, and you roll it about, twisting it with your lips. Then, you twirl your tongue about the tip, making small circles and teasing it to the best of your ability. Spike is panting above you, and sweating too. You can't tell if he's embarrassed or he really has that short of a fuse, but you let go just to keep him from blowing too soon.
"Nurse, if you will," Twilight trots up next to you, "I believe it's time I take over. I'm going to stimulate the patient's prostate to cause orgasm."
Her horn starts to glow, and she lines it up with Spike's tailhole. The horn shifts a bit, becoming blunter, longer, and more deeply ribbed. she lowers her head and prods his pucker with it a couple times.
"Wait, she's gonna stimulate my what? Twilight, don't do this to me, I-uuuaaaaah!"
She doesn't waste a second in hornhumping the little dragon. He's probably never tried anal play before, the sensation must be agonizing for the poor darling. The least you can do for him is resume sucking his little cock. Twilight's little spell assures he'll come to a speedy orgasm, few males can resist her horn play. With a bit of magic she's able to give it a warming, tingling feeling right out of a condom commercial, and the ribbing pushes right up against Spike's prostate, massaging and milking it like nothing else.
"H-holy guacamole..." He says, weakly, before busting a rich nut in your mouth. You swallow proudly and pull back, Twilight continues humping him for a bit before she too pulls out. Her horn shrinks back to normal proportions quickly, and she looks to you,
"Well nurse, our first session went well, but we're going to need quite a few more samples of dragon seed, not counting of course the dosage you've already swallowed. Now, for our next procedure, we..."