"My, my. This is certainly beyond my wildest dreams, hee hee hee~"


That giggle, that *fucking* giggle, set off a new flare of possessive heat within Grillby's core. If it weren't for how gentle he was being with Papyrus and how excited Papyrus had been when bringing up the suggestion, the VUX leader would be nothing but ashes at this point. .That, and that Grillby realized how intensely irrational he was being; ZEX had pretty clearly been mentally undressing both of them since his arrival on Earth, but he hadn't done more than his usual constant flirting until Papyrus expressed interest.

Perhaps the dour VUX woman that had been glaring down his stupid attractive boneless shoulders for most of his visit to Ebott City (*thanks Asgore*) had had something to do with it, but Grillby preferred to think that ZEX's chaperone didn't influence his behavior that much.

Grillby dragged his focus back to the situation in front of him-namely, that ZEX was not so subtly trying to get Papyrus out of his clothes and acting like Grillby wasn't even there. He wasn't sure what pissed him off more and that only made him angrier. "Am I needed here or are you just trying to piss me off!?" he snapped, and immediately regretted it when Papyrus looked at Grillby like he had backhanded him.

ZEX looked at him through the side of his eye and very slowly slid a tentacle up Papyrus's femur and stopped just before going under fabric (which Papyrus whined to protest before ZEX "accidentally" licked his pelvis, lingering on the bared bone like he didn't notice it). "Grillby, *Grillby*, there's no reason for such jealousy. You're always welcome to join in." 
The half-lidded look was infuriating, but the subtly mocking tone was what drove him to action. He stripped off his clothes and moved behind Papyrus (his, *his* lover, even if he had to share how beautiful Papyrus looked when fucked senseless this one time), sliding his hands under the skeleton's shirt and pushing it up to get a look at his ribs. Papyrus gasped quietly at the contrast in temperature-and, to a lesser extent, at Grillby's "sudden" aggression toward ZEX. "Grillby! Calm d-nh!"
Papyrus's objection did give Grillby pause, but ZEX had no such barrier (he wasn't the one being yelled at, after all). He took advantage of Grillby's distraction to toy with the elemental's cock, making Grillby's grip tighten on Papyrus's ribs and causing him to briefly burn blue-violet. Papyrus was, understandably, less appreciative of ZEX's little stunt.

"ZEX! Give us some warning next time!" His voice was slightly pained; Grillby had been surprised enough that he'd bruised and scorched Papyrus's ribs where he'd been holding them (although Papyrus would never tell anyone that; it was something Grillby had had to learn to see on his own). Grillby whispered apologies while ZEX paused to check the damage for a moment, but he quickly resumed his explorations after ensuring that Papyrus's injuries were minor. Grillby wanted to be angrier about it, about ZEX being there at all, but it was kind of hard to stay angry when every time he collected his thoughts ZEX switched from only teasing Papyrus to touching both of them in very distracting ways.
Still, Grillby was past the point of just wanting touch, and he could feel Papyrus's soul starting to meld with his and intensify the sensations they felt. Papyrus was the first to break the stalemate (like always). "Nyeh. ZEX, Grillby, *please*-" He broke off with a whine and ground his pelvis particularly hard into ZEX, and was rewarded by being fucked with quite possibly the weirdest genitalia Grillby had ever seen. He didn't think on it for long, though; really,he barely thought about it at all as he shifted to penetrate Papyrus. If he had, Grillby would have noticed that it had claspers before ZEX used them to grip Papyrus's spine and Grillby's cock in one go. The sudden pressure and phantom sensations from Papyrus's soul would have brought him over the edge if ZEX hadn't tightened just enough to keep him from coming. "Hee hee hee. Not yet, colonel. *We've only just started
8."

Grillby didn't even think about how ZEX knew about his old rank; he was too lost in a lust-fueled haze, too lost in feeling the physical sensations from two bodies and the magical sensations from his and Papyrus's merged soul, too lost in watching Papyrus melt into his arms and ZEX's tentacles. Later, later he would save any thoughts beyond the *now*. 

ZEX loosened the grip on Papyrus's spine enough that Grillby could move again, and he didn't think twice before starting to thrust into the space he was given. Every thrust was accompanied by a moan or gasp or plea for *more, harder* from Papyrus, and Grillby direly wished he could see his boyfriend's face. There was really nothing quite as wonderful as Papyrus when he was throughly fucked, and if ZEX's pleased hums were any indication they were in full agreement on at least one thing.

Grillby couldn't tell how long it took, (it wasn't long enough, it was never long enough for him) but he felt Papyrus's rising orgasm and heard him cry out his name, and under any other circumstances that would have driven him over the edge-but ZEX clamped down on his cock again, right before he could cum, and that brought a semblance of clarity to Grillby's thoughts. Papyrus was panting, flushed with magic, and exhausted, and after being assisted off their cocks said, "I think. That I'm going to just watch now."

The loss of physical contact was disappointing, but Grillby found himself very quickly distracted by ZEX releasing his cock and prepping him. Grillby gasped, arching his back into the slick (with what, Grillby didn't know or care) tentacle sliding into him and the quick, light touches of ZEX's tongue on his dripping cock. "Hurry *up*, dammi-*ah*!"

"That's no way to talk to your commanding officer, colonel~"

The tentacle was replaced by ZEX's cock, and Grillby hadn't realized how *big* the VUX was until then. Grillby could barely stand the slight thrusts into him, but at the same time he needed everything ZEX was able to throw at him. He was distantly aware of Papyrus panting as he got off to the scene in front of him, but it was just another aspect of the ridiculous situation that made him want even more. He heard himself begging for ZEX to move faster, thrust harder, *anything, ZEX, admiral, **please**,* at the same time that he heard Papyrus shakily ordering ZEX to go slowly until he couldn't take the pace.

*Papyrus, you traitor,* crossed his mind briefly and was quickly banished by a skeletal pelvis straddling his shoulders. Papyrus paused shyly, but a gentle hand guiding him onto Grillby's face quickly banished any anxiety. As soon as Grillby began to eat Papyrus out, ZEX began to thrust harder, faster, and the thin line between pleasure and pain was exquisite. Grillby forced himself to focus on the curves of Papyrus's hips, how he squirmed when Grillby licked a particularly sensitive spot, how beautiful the noises he could extract from Papyrus were. It didn't help distract from ZEX fucking him senseless (nothing would; for all of his many, many flaws ZEX was uncannily good at finding exactly the right angle and speed), but it enhanced the experience.

Despite all that, Grillby could tell that he was reaching the end of his stamina. He wanted to keep going, but even if he wasn't utterly exhausted he could feel his old war wounds flaring up. He recognized the way Papyrus's breathing changed just before an orgasm, but he had no such familiarity with ZEX, and the good admiral seemed to have stamina to rival Papyrus. Grillby was, to put it bluntly, out of his league and he was all too aware of it. 

Even so, he heard Papyrus have a *very loud* orgasm above him and that was all he needed to finally come (now that he didn't have a certain betentacled asshole stopping him), coating his stomach with magma-like ejaculate. ZEX came shortly after, his last few thrusts filling Grillby with his cum. They took a moment to catch their breath, before they dragged themselves into a pile and basked in the afterglow. 

--

The next morning and a few more rounds later, they were jolted awake by the sound of someone hammering at the door. 

"ZEX! GET YOUR DAMN PANTS ON, YOU'RE LATE FOR THE MEETING WITH THE KING!"

.Grillby decided that he would let ZEX deal with pacifying DAX and tried to not laugh at his rush to appear mostly decent before she broke down the door and dragged him there as-is.