Behind.

Vivia realized her back was against the knotted hole in the tree, and with a shuddering flinch, she became aware of something slick and cool emerging from it to touch her bare back.

Try as she might, she couldn't work her arms free from the twisted confines of her tunic, and with one leg trapped beside her, her struggles were all in vain. She felt the slippery substance ooze along her back, and slowly spread farther. She wasn't able to push herself far enough away from the tree to avoid its wriggling advances, ending up having to just hang there, chest heaving as she caught her breath.

The slime slid across her skin with undulating movements, its thick, viscous body leaving a slippery residue wherever it touched. As it began moving faster, Vivia gasped and let out a whine, feeling it slip down into the back of her buckskin breeches.

She squirmed as it oozed along the cleft of her butt, traveling lower as its body pulsated rhythmically. It seemed no matter how tightly Vivia closed her legs, it found a way to slide down to where she could only grit her teeth at its arrival.

She felt it wriggle even faster, though by now it stopped moving. Groaning through her teeth, Vivia now tried to open her legs more—not easy with the one caught in the branches—but the slime wasn't budging, even as she started shaking her body to try and get it out. She cursed again, this time at the tightness of her breeches, and the slimy thing inside them.

Vivia soon slowly felt the sensation of what could only be the slime sucking at her body, molding itself to her nether-regions and even delving inside her. Her disgust was punctuated with a moan she found herself embarrassed to admit was pleasurable. As she squirmed against the tree, biting her lip, the slime seemed to writhe with a suction that tugged at some of her more sensitive places.

The slime quickly began to warm up, and surpass even the heat it brought to her cunt. The space between her legs was filled with a slippery, undulating warmth that suckled every inch of skin it touched. As it did so, it coated her and her breeches with a slimy secretion, coaxing her own fluids from her body in the process.

Before she knew it Vivia's body had given in to the myriad sensations, and with a shuddering gasp, the slime was awash in fluids she could not control the release of. She twitched against the trunk of the tree, bucking her hips in a climax as something wet ran down her leg.

After moments of heavy breathing, and a somewhat gentler suckling by the slime, it stopped altogether, and seemed to start moving again.