Deal!

"I take it, that I am to your liking?" The creature asked.
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"Fuck yes, you don't even know the last time I enjoyed a good dicking like that." Myria moaned. "I.. I think I can agree to your offer... What was it again?" She asked.
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"Why my dear, the offer is simple. In exchange for my aid in dealing with one of these creatures, you or one of your companions will become my mate henceforth, with all the benefits that entails."
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"Well... I guess I could..." She mumbled sucking more of the pink fluid from the vine.
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"Excellent!" The creature boomed. "Now all I require is for you to bring your companions here, so I can explain how all of you should proceed." It said as it lowered her to the floor.
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Myria groaned as the vines slid away, robbing her of the last sensations of pleasure. "And if I agree to be the one to stay, can't you just help them from here?" She asked as her hand slipped to her mound, and began teasing her clit.
"No, no such a decision requires time, and the supplies I need to give to your companions need to be given personally alas." The creature replied.
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Myria deflated slightly, and pouted. "Fine, but only if we seal the arrangement with a fuck now." She said, as she stood and moved to kiss the creature. Her tongue slid into the creatures mouth, discovering no tongue, but in fact soft sponge-like material that expanded and contracted around her tongue. An immensely sweet liquid oozed into her mouth as she kissed with more fervour, the taste alone sending shivers down her spine. All that she could not consume of the liquid spilled over her lips and onto her breasts, leaving tingles of sensations.
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She moved her hand down to the creature's bulge, to find it covered with leaves, not giving a single detail as to what lay beneath. The creature's hand moved hers away as it promised, "You're not ready for such pleasure my dear, later, perhaps."
Disappointed, yet still horny, she sank down to all fours and raised her buttocks to the creature, giving them a teasing wiggle. She always loved getting it doggy style, like a bitch in heat she could go all night long in this position. She wondered if the creature was familiar to it.
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Taking its cue, the creature twitched a hand, after which vines approached Myria from all sides. First slithering from between her legs, up to her breasts and then back, exploring every inch of her body. Other vines slid between her buttocks and up over her back, coating almost all of her in a lubricating liquid.
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Then, all at once, the vines shot straight into all her holes. Her pussy, mouth and even ass were violated simultaneously, thrusting deep on the first stroke. Myria grunted at the sensation, as her ass had not been violated in a long time.
As all of the vines began thrusting at different paces, myria felt all her holes warming up, as the vines began excreting the familiar pink liquid. The effects on her ass and pussy however, were new and sent her into a pleasurable delerium. She was now aware of every single inch of her innards, as if she had sprouted thousands of new nerve endings in all of her inner walls. The vines rubbing and writhing against them were ecstasy, which she could take no longer, before her legs quivered and she orgasmed hard, feeling some of her own pussyjuice mingling with the pink goo and slowly running down her legs.
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As she panted in her post orgasmic bliss, more vines wriggled up between her legs. Before she could try to voice her protest, two extra vines speared into her pussy, filling it completely with these writhing givers of pleasure.
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A second vine penetrated her ass, winding around the first vine in a corkscrew manner. Then both vines thrust and moved independantly, making obscene sloshing noises above Myria's muffled wails of ecstasy, as she tried and failed to gulp down every last drop of goo passing into her mouth. The pink goo drooled freely from the corners of her mouth, leaving pink trails, slowly oozing towards her breasts, whereas the remaining droplets were slowly forming a puddle of mixed fluids on the cave floor beneath myria.
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As one vine, had found a rythm of stroking Myria's clit each time it thrust inward, Myria's arousal grew to new heights. The coiling and writhing vines within her pussy continually stimulated her G-spot until she could no longer support her own weight, and collapsed forward in a twitching, post-orgasmic mix, in the middle of a giant pink puddle of sex juices.
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The vines slowly withdrew from all holes, leaving them gaping and leaking all manner of fluids, to Myria's weak protests.
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The creature once again approached.
"Now, it's time you go find your allies, my dear."