The Martian triplets.

You knock on the door of the guest room, and after a moment, it opens, and one of the Martian visitors (who might be Alpha, for the sake of argument) greets you. “Ah,” she says. “Excellent. We have anticipated you.”

She is entirely nude. Her skin is the same shade of emerald green from head to toe, punctuated notably by her dark green nipples and a small patch of dark green hair at her crotch. Her breasts are medium-sized, not huge, but a handful; her stomach is smooth; her hips are round; her legs are short (as expected, since she’s only five feet tall) but well-formed.

Her fellow travelers are visible in the room behind her, and they’re also nude, demonstrating that they really are identical in almost every detail. Beta is seated on a stuffed chair in the corner (assuming it really is Beta) with her feet curled under her, and Gamma (hypothetically) is lying on her back on the bed, one knee drawn up, consulting a copy of Cosmopolitan.

Alpha continues to gaze at you calmly, as if she expects you to regard a room full of beautiful green nude women as a commonplace sight. “We were hoping,” she says, “that you would be able to assist us with a few experiments.”

You find it difficult to keep from staring at Alpha’s breasts. Or Beta’s breasts. Or Gamma’s breasts. “Uh … yeah, um … what kind of experiments?”

“Excellent,” she says again. She takes you by the hand, gently but firmly pulls you into the room, and shuts the door behind you.

Beta gets up from her chair, and Gamma sets down her magazine, and you are suddenly apprehensive about what you might be agreeing to. What if they want to vivisect you or something? Maybe all Martian perform vivisections in the nude. “Wait,” you say, “what kind of experiments? Because, uh ...”

“Sexual experiments,” Alpha says, stepping close and starting to unfasten your pants. “We are attempting to make sense of your procedures, and it occurred to us that it might be useful to have a live male at hand for illustrative purposes.”

“And so that you can provide verbal clarification,” says Beta, who has stepped around behind you and is taking your shirt off.

“And give your opinion on our technique,” says Gamma, who is sitting on the floor, unlacing your shoes.

Working as a team, the three of them have you out of your clothes in moments. They step back then, and regard you scientifically, eyeing your naked limbs and your rising cock.

Alpha (you’ve lost track of them again … is that one Alpha?) says, “Good. Now, the first procedure we were hoping to step through is …”