North, to the grassy plains

You decide to head North. Throwing on an exosuit and placing the Galactic Translator in your ear you step down off of the cargo bay ramp. This planet is one of the many planets that were studied to ensure that it was safe enough for civilian guild explorers to venture on with no deadly hazards but that was only the initial viewing. Fauna and flora were deemed non-hostile and the planet was green lit.

The forest between you and the plains is warm but not uncomfortably so. You unzip your suit jacket and take it off so it hangs off your waist exposing your torso and the undershirt you wear. The Guild always asks that necessary precautions are taken on yellow and green light planets to not damage the ecosystem, but interaction with the local species is okay so long as no violent actions are taken. You walk about a half mile through the sparse woods, and the shade and lyrical noises from the local fauna make for a pleasant walk.

As you near the edge of the woods you hear something that makes you pause. Something is happening just ahead of you, and initially you hear what sounds like... Moans? You stop and listen more intently. The sounds are coming from ahead of you, beyond the bushes.

Silently you walk up and look through and your mouth drops open at the two in front of you. The two look like they are straight out of one of those old fairy tales, centaurs! Well similar at least. And very female as well. Their fur on their flanks is a pale gold but its darkened from sweat, glistening in the sunlight. The first has dark blue hair rolling down from her head to her shoulders, and the second peaking over her flank has shorter green hair. Their top halves are bare, one heaving up and down as she quivers in pleasure, the other female is leaning towards the firsts rear. Her face is plunged deep in the seconds nethers, the sound of slurping and moaning much louder now that you are closer.

You have a clear view of Blue's rear as Green-hair sits up, licking her lips. Her fingers plunge into Blue-hairs' pussy while her other hand rubs her anus. She pulls her fingers back and licks both hands clean before plunging her fingers back into Blue's wanting pussy. Her other hand is rubbing Blue-hairs clit and she moans loudly.

You watch Blues upper body as she gropes her own breasts and pinches her nipples, hearing her moans over Greens heavy breathing.
Your pants have tightened, your cock throbbing and the incredible display only a short distance from you. Looking on the two lost in their lust you find yourself wanting to approach them...