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When San wasn’t contemplating whether a butt was made up of two shapes or was one uniform shape in and of itself, he was trying to figure out which one of them had the best one. But (hah) it was difficult to rank them, since he didn’t have the proper evidence to support his claims. Sure, he had an idea of what his members’ butts were like, but the more he thought about them in relation to each other, he realized he needed to get a closer inspection.
Long story short, San needed to do the right thing and conduct his own research.
Yunho wasn’t someone who was hard to get ahold of, given that they shared a room and that San loved to give him affection. That affection never fell short, especially when it came to his shapely asset that never failed to fill out his back pockets, even without padding.
Yunho returned to their room when he was done with his shower, wearing nothing but a towel around his waist. He seemed to have dried himself off in a hurry as water droplets still rolled down his flushed skin. San eyed him intensely from the top bunk as he bustled about the room. Watching Yunho roam around like that made him dizzy, and he wanted to perform his tests right away.
“Hey, Yunho-ya,” he called out.
“Hm?” Yunho turned to him.
“Are you clean? Like, really clean?”
Yunho let out a flustered laugh at the question. “Yes?”
“Can I see?”
A mixture of emotions manifested on Yunho’s face, including the confused furrow of his brow and the amused twitch of his lips. There was also the infectious excitement dancing behind his eyes that San loved to ignite.
“What for?” Yunho asked innocently. He curled his fingers around the towel where it wrapped around his waistline. San bit back his groan when Yunho didn’t make any further movement, leaving the towel still fixed around his waist.
“I wanted to do a test. Would you let me try?” San asked.
“A test? Well, okay,” Yunho laughed. He didn’t need much else convincing, and so he dropped the towel.
San whistled appreciatively, to his embarrassment. “Hey!”
“There’s nothing to be embarrassed about!” San assured him. “Wait. I’ll join you down there.”
A few laughs still slipped past Yunho’s lips as he disappeared to his bottom bunk. San climbed down the ladder and joined him, eager to finally get his hands on him.
Yunho’s upper body was so sensitive. He couldn’t stop squirming, simultaneously arching towards and shuddering against every featherlight touch placed on his chest.
“It tickles,” Yunho halfheartedly complained, eventually calming down once he got used to the touches.
“Is that so?” San hummed, slowly thumbing circles around Yunho’s nipples. He meant to tease, but once he pinched them, Yunho’s reaction became explosive. A loud moan left his lips as his body jerked, nearly kneeing San in the face.
“Baby!” San gasped.
“Sorry! Are you okay?” Yunho almost rose, but San pushed him back down. His face reddened when San had to hold his waist still, and he whimpered when fingertips dug into his skin.
“I’m fine.” Contradicting his touch, San’s smile was gentle. It was always fun to play with Yunho like this, though he was nowhere close to his optimal testing zone. He spread Yunho’s legs and hummed. “Why don’t I get you a pillow?”
San was about to go up to his bunk to grab his extra pillow, but Yunho must want to keep him close so much that he took his own pillow that was beneath his head and instead shoved it beneath his hips.
“Don’t have to anymore,” Yunho said, chest quietly rising and falling for breath.
San just giggled at his eagerness. Still, he needed something from his bunk, which was some lube. He decided that he shouldn’t stall anymore after he grabbed it, and scooted back some on the bed before lowering himself on his stomach. His head made a perfect fit between Yunho’s legs that were slowly guided up. Yunho took the hint and held his folded legs up to his chest, his anticipation somewhat relieved when San pressed a kiss to his thigh.
“Feeling okay?” San asked, looking up at Yunho.
“I’m great,” Yunho nodded. “Go ahead. Please.”
“Thank you,” San smiled at Yunho’s politeness. He finally lowered his head, past Yunho’s hard cock and instead to his hole. He gave a small lick at the pucker, leaning back to watch in fascination how it fluttered around nothing.
Yunho’s breath went fast at the small contact. A plea was on the tip of his tongue before San dove back in. San was less careful this time, gripping the backs of Yunho’s thighs hard and angling his hips higher just to have better access to his hole.
San was breathless already, not because he was being smothered, but because he loved Yunho’s ass so much. He usually couldn’t stop talking about Yunho’s ass, and the only way to make him shut up about it was to put his money where his mouth was and eat Yunho out. There was everything to love about Yunho’s ass, from the perfect fit his cheeks made in San’s palms, to its hypnotizing jiggle whenever it was smacked. Even the peach pink blush that glowed on the skin was something to behold.
In short, San just really loved Yunho’s ass. He figured his bias was showing a little, but he couldn’t help it. Yunho’s reactions were spurring him to spread him wider and push his tongue in deeper, and doing just that earned him the sweetest sound he’s ever heard slip past Yunho’s lips.
“A-ah...” Yunho stammered out, a breathless lilt to his voice as San kept lapping him up. “S-San-ahh...”
San smiled once he heard his name melt into those incoherent yet addicting sounds. He felt Yunho’s legs quiver against the sides of his head as he struggled to keep them open for San’s sake. While San would’ve loved it if Yunho let go and reacted however he wanted, he still appreciated his restraint.
He allowed Yunho a little break, rising to wipe his mouth. Yunho lowered his legs and tried to catch his breath. He was in a bit of a daze as he remained facing overhead, and only snapped back when San gently patted his thigh.
“Turn over for me?” Yunho did as he was told. Rolling over drew San’s attention to the very thing he’d been so obsessed about, and he had to give Yunho’s pertinent ass a squeeze in thanks. The skin pinkened when San released him, and San wanted to give it a bite as if it was an actual peach.
San didn’t let Yunho reply, distracting him by spreading him and diving right back in. Yunho cried out once San’s mouth was back on him again. He was raising his hips ever so slightly, desperate to have San’s tongue fucking into him.
San took the opportunity to lube his fingers up, introducing them alongside his mouth. He felt Yunho’s hole spasm against his fingertips as he rubbed, and eventually pushed them past his rim once Yunho started begging. Yunho’s moans were unrestricted as he kept begging for more, whether it be for more of San’s fingers or even his dick.
The latter request made San stifle a laugh. He pressed a kiss to where his fingers were pumping inside Yunho and sat up. “I don’t think my dick will be very relevant for my test...” he said, encouraging the stretch of Yunho’s hole by slightly parting his fingers.
“Why not?” Yunho huffed. “What’s this, ngh, test even about anyway?”
“Oh, just who has the best butt,” San said, patting Yunho’s cheek.
“And where am I in the ranking?” Yunho was eager to know.
“I haven’t gotten to the others yet, so you’re automatically first.”
Yunho whined at that. “Not good enough.”
“Fine. You’re an eight out of eight,” San declared.
“Eight?” Yunho repeated. “Why eight?”
“Well, because it still means full marks, and when you turn it around it sort of looks like a—”
“Okay, I get it! But I better be the only eight out of eight,” Yunho mumbled.
“Sure,” San smiled and kissed his nape. But by leaning forward to reach his neck, he drove the fingers inside Yunho even deeper.
“Fuck me,” Yunho cried. He spread his legs even wider and arched his back, making his ass stick out.
He really knew the way to San’s dick. “Yunho...”
Yunho threw a pleading look over his shoulder. San’s fingers were still plunged deep in Yunho’s ass, but that didn’t stop Yunho from begging for more. “Sannie, please...”
Yunho was really pulling out all the stops presentation wise. The sight of him like this was all too tempting. It made San want to eat him up, which he kind of already just did, but he wanted more.
San palmed himself, just to relieve himself for a bit. The motion didn’t go unnoticed as Yunho followed his hand and bit his lip in anticipation.
San couldn’t take his clothes off with just one hand, or he was just too impatient to, so he had to pull his fingers out of Yunho first. Even though Yunho knew what was coming, he still whined. He was already trying to replace San, reaching behind himself to stuff himself full with his long fingers.
San would have loved to watch that for the rest of the night, but he needed to find a condom. To his surprise, the drawer where they usually were was devastatingly empty.
“You didn’t refill the condoms?” San asked.
“If I had known you were horny, I would’ve,” Yunho groaned.
“I am not horny. I am doing research,” San corrected him.
“Well, the test subject is going to pass away if you don’t hurry up!” Yunho sounded urgent, but San just muffled his laugh. Yunho was funny when he was needy.
San left their room with the quest of obtaining a condom. He fulfilled it quickly once he remembered the stash in Wooyoung’s room. San had been holding onto a favor Wooyoung owed him, so he decided to use it at that moment. Thankfully, no one was inside when he poked his head in. He grabbed several packets and hurried back to their room.
Once he returned, Yunho had flipped himself over, and the pillow that was once beneath his hips was tossed onto the floor. He arched off the bed as he tried stretching himself with his fingers, rutting his cock against his other hand at the same time. He looked frustrated but determined, teeth digging deep into his lower lip.
He deflated in relief once he saw San come back, pulling his fingers out of himself.
San tossed the condoms onto the bed and made a show of undressing himself. He wanted to take his time but he ended up looking less seductive and more silly once he pulled his shirt over his head. His hair stuck out at several places which he had to slick back down.
Yunho laughed at first, but quieted once San’s pants were pooling at his feet. San felt very empowered by Yunho’s watching, but he was a responsible person so he gathered his clothes and Yunho’s towel and dunked them into the laundry hamper.
“Nice shot,” Yunho approved. He spread his arms, beckoning. “Now come here.”
“I am here,” San pointed out, making his way over to the bed. He gave Yunho’s lips a peck before Yunho was pulling him back down to kiss him some more.
San busied himself with kissing Yunho silly, but also with opening one of the condoms so he could roll it down his cock. He huffed a little against Yunho’s mouth as he lubed himself, mainly out of relief.
Yunho tried to get a look at San lining himself up, only to throw his head back once San slid in. Yunho’s hands clenched and unclenched before they scrambled to grab ahold of anything: San’s shoulders, waist, and then San’s hands to intertwine their fingers. San guided Yunho’s hands above his head, waiting until Yunho had gotten used to the feeling.
The flush on Yunho’s skin deepened as San raked his eyes down his body. He bit his lip when San released his hands to reach down and instead touch his cock, mainly thumbing over his sensitive head. San applied a bit more pressure with his thumb and started to rock his hips, making Yunho’s mouth fall open in a gasp.
“Yunho...” San began without really having any idea of what he wanted to say. Yunho just had that effect on him, which was often a source of teasing, but teasing was the last thing on their minds as San’s legs met Yunho’s.
San couldn’t control his own sounds, leaning forward to muffle his voice against Yunho’s neck as he came apart himself. Yunho felt so good and he was taking San so well, desperately scrabbling at San’s back to have him closer and letting out the sweetest sounds San had ever heard.
San had the flesh of Yunho’s neck between his teeth when he gave one more thrust and spilled into the condom. Yunho trembled as San stilled, coming down from his high.
It was clear when San had come down, because then he was blowing on Yunho’s neck, his breath tickling the bruise he created there. Yunho was especially ticklish there. He raised his shoulders to his ears to protect his neck and weakly pushed San away, but to no avail. San was insistently nosing his throat, peppering kisses along the column.
“San-ah,” Yunho managed through his giggles. He shook San by the shoulder. “C’mon, we have to clean up...”
“I have to make you come,” San said. He pulled out of Yunho and aimed the condom for the bin that was across the room.
Thankfully, he made the shot, and celebrated by flopping right onto Yunho’s body. He felt Yunho’s erection sandwiched between them and rolled on his side, reaching down to touch him.
“You can, ah, do that later,” Yunho said, closing his eyes once San’s fingers wrapped around his cock. He put his hand on top of San’s, but instead of plucking him away, he just rocked into the grip and sighed.
San tightened his grip and watched Yunho’s face. He was so fascinated by Yunho’s pleasured expressions and the deep breaths he’d take in with every stroke that he didn’t want to blink.
Soon, Yunho’s soft sounds turned urgent, and he was nearly lifting his hips off of the bed to fuck into San’s hand. San knew he was close, so he encouraged Yunho to come by pumping him in earnest, pressing a kiss to his cheek. Yunho turned his face so their lips would meet, and just as San’s tongue slid against his, he came, softly moaning into San’s mouth.
Yunho’s hips gave weak little kicks as San kept touching him even beyond his cock, moving down from his balls and then up to the line of cum he shot up himself. San was certainly entertained, but Yunho felt sticky and the thought of cleaning up still loomed over him.
San caught onto his mood quickly and got Yunho’s towel from the laundry hamper, wiping his body down with it. He gained a kiss in thanks, Yunho wrapping his arms around San’s neck to pull him close.
It took a long while for them to separate, and it was only because San remembered that after Yunho, it was actually his turn to shower.
San realized he was lucky that they had an ensuite bathroom. It wasn’t only because he wouldn’t have to sneak down the hall naked to reach it, but it was also because no one besides Yunho could overhear, with delight, the squeak he let out when his ass got pinched. It was affectionate though, and San supposed he deserved it after the ministrations he put Yunho through.