Sans and Grillby were sitting outside, the picnic Grillby had carefully cooked and packed was laid out on a blanket on the very crest of a small hill. Not that either of them were enjoying it quite yet, they were sitting in the grass nearby, plucking the blades and admiring the feel of it running through their fingers. Grass hadn't grown on that tiny moon. The sun came out from behind a cloud (two more things that just didn't exist on Ebott, trapped as it was in a tidal lock and lacking enough atmosphere for something as frivolous as clouds). Sans turned his face into the warmth, eyes closed in bliss as he basked in the light. Grillby couldn't help feeling jealous. But at the same time the sight was so precious, so beautiful, so pure…

Grillby leaned in and gave Sans a little smooch on the cheek.

Sans gasped, eyes opening wide in surprise. He turned in time to see Grillby laugh, his own eyes crinkled as he joined in the laughter.

"what was that for?"

"… I couldn't help myself." Grillby leaned forward and kissed the other cheek. "… There, now they're even."

They both started laughing again, clinging to each other for support. The problem with clinging to someone for support when that person is clinging to you for support is that really neither of you have support. They both fell over, sprawling out as they laughed helplessly, neither one even sure why anymore.

Eventually they started to calm down, staring at each other through the grass. Sans brought up a hand to wipe some of the glittering stardust clinging to his cheek off and looked at it. "it's still so cool! but papyrus is going to tease me horribly about it."

"… Let him, he's just jealous he doesn't have a wonderful datemate like me." Grillby pulled Sans closer, nuzzling their faces together. More stardust spread over Sans's nasal bridge, then up to their foreheads where they were now touching.

Sans couldn't help laughing at that, though he swatted Grillby's arm playfully. "be nice, papyrus could have anyone he wanted for a datemate."

"… Anyone but me." Grillby smirked at Sans.

"who would even want you?"

"… Papyrus's utter trash goblin brother."

They both laughed at that, rolling onto their backs so they could howl in delight. "says the guy… dating… heh dating said… trash… goblin!" Sans gasped and sputtered, laughter too hard to even string together a single sentence.

"… Trash goblins," Grillby devolved into more laughter, unable to talk for nearly a whole minute, "… they can't," a gasp, a wheeze that turned into three, "… beggars can't be choosers!" Grillby finally gasped out.

"are you talking about me or you?"

"… I don't even know!"

They both burst into laughter again, wheezing and snorting as Grillby clutched his belly and Sans kicked his feet. Sans had to wipe away a few tears, Grillby just let his float up and away from him. Sans stopped dead to watch the tears gather at the corner of his datemate's eyes, then lift up into the air, the affect much like watching bubbles rise from deep waters.

"whoa."

"… What is it?" Grillby turned to look at Sans in concern.

"your tears float. they even glow too."

"… Well, a star is made mostly of hydrogen and helium." Grillby wiped at the last vestiges of tears and flicked them away.

"and those are both lighter than oxygen," Sans murmured as he watched the last tear float up and out of sight. "you're so amazing."

"… Why thank you." Grillby pulled Sans close, he hummed in contentment as he nuzzled the top of the other's head.

Sans was aware of the smear of shimmering stardust Grillby had left on his hoodie, and knew his whole face and skull were likely equally as sparkly. Sans wondered if this was some sort of star thing? Maybe marking his territory, like a cat rubbing its face on the people it likes. Ah well, it was a nice day and he was enjoying himself. Sans snuggled deeper into Grillby's hold and enjoyed the warmth his boyfriend radiated.

Grillby was so content. Everything felt so right with the world, they were both safe and free. He let himself relax and start to drift off.

"so, we gonna eat all that wonderful food you spent all day slaving over a hot stove to make or just cuddle?"

"… Why can't we do both?"

"sure, i could go for both."

Standing up without letting go of each other was a bit of a struggle, there were two false starts and one stumble, but they eventually managed to stand up and walk to few steps to the picnic blanket with arms slung around each other. Once at the blanket Grillby finally had to (reluctantly) let go so he could sit down, then immediately pulled Sans into his lap. Grillby wrapped his arms around his short datemate and just enjoyed cuddling him while Sans finally opened the basket.

Bonus:
"SANS! I SEE YOUR DATE WENT VERY WELL!"

"don't know what you're talking about, bro."

"YOU LOOK LIKE YOU FELL FACE FIRST INTO A VAT OF GLITTER."