Chapter Text
Thanatos—Mr. Chthonikos to his students—stared at the note atop his desk. His last class, the advanced calculus class, had all filed out into the hall, and he was certain that Ares hadn’t come anywhere near his desk, and yet there the note was.
It was a mere scrap of paper, with “10:50am” scrawled at the top, a set of squares that would be incomprehensible to anyone else beneath it, the one on the end marked with an X, and a little doodle of a sword and two lightning bolts under that, all in red ink.
Thanatos adjusted his glasses.
The note, of course, didn’t go away.
Neither did the twitch in his pleated khaki trousers.
Dammit. It was a good thing his next lesson would be mostly him writing on the blackboard so he could keep his back to the class.1
He got through college algebra, finishing by assigning homework earlier than usual and saying, “And that’s all for today. You can start work on the problems in the book now. I need to excuse myself, but you’re all adults, I’m sure you can manage to dismiss yourselves when class is over.”
Then, feeling his trousers entirely too tight, and far, far too much of an excited, anticipatory shiver running down his spine, he left his classroom and hurried down the hall to the bathroom at the end of it. That one was shabby and only had three stalls, so nearly all the students used to recently refurbished one near the math building’s front doors, not this rundown second floor restroom.
Somebody was in one of the stalls anyway, but not the one Ares had marked. Sometimes Ares was already there waiting for him when this happened, but this time the stall was empty. Thanatos slipped inside and closed the door but didn’t lock it.
After mere seconds he found himself having the urge to pace. There wasn’t enough room for it, and it would look strange to anybody who came in. Instead he reached into his jacket pocket and pulled out a little packet he’d started keeping there. One of two, in fact. The other, the condom packet, he left alone, but he broke open the little container of lube and, after undoing his belt and pulling his trousers down, he started fingering himself.
His cock was a hard ache, his briefs damp with pre, and the ache only got worse as he worked himself open. If Ares didn’t get here soon…
The bathroom door opened and Thanatos froze. He put a hand to the door of the stall he was in, so if it was somebody else, they wouldn’t just walk in on him. But surely this would be Ares?
Footsteps went into the stall next to him.
Dammit! Thanatos clenched his teeth on a whine of desperate need. He knew he was being pathetic, but he couldn’t help it. He was on fire with arousal, and he’d never met anybody who could satisfy him the way his latest star student did.2
Then the door opened again and a heavier tread entered, going straight to the stall where Thanatos waited. Instead of trying the door, the person outside tapped on it twice, a barely audible knock. Thanatos let go of the door, allowing it to swing in, and Ares slipped instantly inside and locked it behind him.
Thanatos didn’t have time to scold Ares for being late before he was grabbed, lifted, pinned to the wall above the toilet, and his trousers yanked off from around his ankles. Ares kissed him hard and ground against him for just long enough to steal Thanatos’ breath, then unbuttoned and yanked down his own jeans one-handed. Also one-handed, displaying the strength that always made Thanatos’ knees weak, he stripped his shirt off, easily switching his support of Thanatos against the wall as he did.
Thanatos clung to Ares, feeling the hard muscles beneath his dark skin, intensely aware of how huge Ares was compared to him. Ares pushed Thanatos’ jacket open and his shirt up, hands gripping flesh, fingers digging in, and ground his cock against Thanatos in a rough tease that left pre smeared across his lower abdomen.
Thanatos managed to grab the condom out of his pocket and awkwardly tore the packet open. “I’m ready,” he whispered. “Take me already.”
Ares chuckled softly, a deep rumble, and obligingly pulled his cock back. Thanatos reached, shuddering as he got his hands on the thick, hot hardness of it, and rolled the condom down it. With a low growl Ares shifted again, moving Thanatos too so he could line himself up. He thrust in with no further prep, and Thanatos, who hadn’t really been ready for that massive shaft, bit his lip so hard trying to stay quiet that he drew blood.
With a nearly silent moan Ares kissed him again, licking and nipping at the bloody spot on his lip. Then he started to move, thrusting hard and deep, driving Thanatos against the wall with each stroke, and began to bite at Thanatos’ neck.
“No marks,” hissed Thanatos, all too aware that he’d worn a low-collared shirt today. He normally wore turtlenecks, but it had been so warm…
“Of course,” murmured Ares, licking at the spot instead of biting, his hips not faltering for an instant.
The hand not holding Thanatos up stroked and groped possessively over Thanatos, squeezing his chest, feeling the barbell piercings there, sliding down his body, and eventually ending up wrapped around his cock.
“I knew I had to have you the instant I saw this,” said Ares, his voice low and breathless. “Such an unexpected thing for a stuffy little mouse of a math professor to have.” His hand ran up the shaft, rough calluses tugging at each of the ladder piercings there.3 Thanatos let out a groan, unable to help himself, then bit his lip again, but at some point the person in the next stall seemed to have left, they were alone in the bathroom.
“Ah, Ares, please,” he moaned. Then the door opened again. Ares froze for just a moment, while Thanatos held his breath.
“Mr. Chthonikos? Than? I thought I saw you come in here? You’re going to be late…” The familiar voice made ice form in Thanatos’ guts. Zagreus. His younger foster brother and current algebra student. Fuck.
Ares started moving again, slow now, avoiding the slap of flesh on flesh, but still driving deep. Thanatos put his hand to his mouth, biting the heel of it hard to stay silent. Zagreus stood there in the doorway, Thanatos could tell the door was open, for a long moment, then made a little “Heh,” sound and turned and left.
“Fuck,” groaned Thanatos.
“Forgive me for keeping you late. I… Ha… I won’t be long.” Ares began thrusting even faster than at first, though still just as hard, Thanatos barely able to breathe as the rough strokes drove the breath from his lungs. At the same time Ares squeezed Thanatos’ cock and stroked it, hand tugging over the piercings repeatedly, all of it well-slicked now with the constant dribble of Thanatos’ pre.
“Please,” breathed Thanatos, on the edge, used so thoroughly, knowing he would be feeling this for days, and so turned on he couldn’t even think.
“Yes,” groaned Ares, and then he was coming, hot pulses deep inside Thanatos making him shudder with how good, how completely perfect it was to have Ares fill him.
Thanatos came mere moments later, covering Ares’ hand and his own thighs with spurts of thick cum.
Ares pulled from him and lowered Thanatos back to the floor, having to support him for a moment while he got his wobbly legs steady beneath him. Ares pulled off the condom and tied it off, while Thanatos started wiping himself off. He got more or less clean and got his trousers back on while Ares put his shirt back on and did up his jeans.
Thanatos left the stall, managing to walk somehow, and feeling very glad the restroom was still empty. Ares paused to toss the condom into the trash and, sensibly, wash his hands.
In the hall Thanatos’ sense of fulfillment and relief at having gotten away with another clandestine between-classes-fuck evaporated as he saw Zagreus leaning against the wall beside the restroom.
“Ah, Than! I thought it must be you in there. Too embarrassed by bodily functions to talk while—” Zagreus halted, eyes going wide, as Ares stepped out of the restroom, gave Thanatos and Zagreus both a nod, and headed down the hall.
“Wait. Ares? But… There was only one stall being used. Did you…?” He looked at Thanatos.
Thanatos, face bright red, said, “No time to talk, I’m already late.”
“But—”
Thanatos turned, feeling like he wanted to die of embarrassment, and strode towards class, with Zagreus, obviously full of questions, trotting behind him.
He knew Zagreus wouldn’t say anything during class, but given how often they still ran into each other at family events, Thanatos had a feeling that he’d never be able to live this one down.
Feeling the amazing soreness Ares always left him with spark perfect pain through him as he walked, though, he had the thought that it was still worth it.