"God," Don choked out harshly. He yearned to feel Charlie's mouth on him. He ran his hand through his own short-cropped hair. "Charlie," he croaked hoarsely, bringing his brother's gaze up, wordlessly communicating his need to the young genius.
Charlie smiled sexily. He leaned forward and wrapped his lips around the tip of Don's erection, earning a sharp cry and a thrust of Don's hips as a reward. Smiling to himself, the younger man started to suck on his big brother's tool, wrapping his tongue around the head, slipping his pointed tongue-tip into the tiny slit. He reached up with his free hand and grasped the sac that hung between Don's legs, fondling softly, rolling the spheres around in his palm. Charlie felt Don shiver, a throaty groan escaping the elder brother's throat.
Bobbing his head slowly, Charlie took Don's meaty pole deeper into his mouth, wrapping around the warm shaft, enjoying the taste of his brother's smooth flesh on his tongue. He continued to bob back and forth, running the edges of his teeth softly along as he went. He pulled Don's member out of his mouth, dragged his lips up the shaft, then snaked his tongue over the tip. He gently scraped the edges of his teeth on the sensitive, spongy cap, then licked up the wetness that seeped out, loving the taste.
Giving that delectable manhood one last suck, the young professor rose from his knees and stood in front of his lover. Reaching out, he grasped Don by his head and covered his lips with his own, kissing him hungrily, then thrusting his tongue into Don's willing mouth.
Don could taste himself on Charlie's tongue, and that only made him hotter. His skin was flushed from what Charlie had been, and was still, doing to him.
"Charlie," he whispered when he pulled back from their kiss. Then he moved back in and kissed his little brother lustily while he slipped his hand between them to pull at the belt around Charlie's waist. Once undone, he unfastened the pants and snaked his hand into the smaller man's briefs, feeling the hard flesh against his palm. He could already feel the wet tip of his brother's erection, and wondered if what Charlie had done to him made the mathematician so hot that he might just explode in his hand if Don wasn't careful.
Pulling back away from Don, Charlie started to shove at his pants, dropping them then kicking them off, along with his underwear and shoes. Quickly, he spun his lust-fogged elder brother around and urged him to bend over. Once Don was splayed face-down on the desk, Charlie knelt and nipped at the pale, muscular asscheeks. He swirled his tongue around Don's crack, licking between the clenching glutes. Then he spread the tensed globes with his thumbs and thrust in deeper.
Don groaned and pushed his ass back, trying to get Charlie's enflaming mouth closer to his hungry hole. The tip of Charlie's tongue soon found the puckered opening, and he made it into a hard point and drove it in. Panting and groaning with excitement, Don's eyes slipped closed and his head sank to the desk as he felt Charlie's tongue work his ass, hot and wet, exploring his innermost depths. Don let his sphincter relax as his brother drilled his tongue into it.
Deeper and deeper Charlie probed until he felt Don fully relax. His ass was ready for him. He scrambled up into position and tugged on his rod a few times as he added some hand lotion from the desk to his saliva anointing his older brother's asshole, then he placed the leaking, reddened head at Don's entrance. Breathing hard and quivering with excitement, he pressed the tip of his cock past his brother's accommodating sphincter. Charlie groaned loudly as the muscles bore down on his sensitive crown. He had to stop and grab onto Don's hips to steady himself as his head swam with the mind-blowing sensations the constricting ring made as it gripped just behind his cockhead.
Don groaned with him. The slow penetration and the stretching of his sphincter as Charlie began to spread him open sent fire radiating from his anus. The erotic burn began to spread, but he wanted more! He wiggled his ass back a little, grinding on Charlie's minute penetration, seeking fulfillment, pushing Charlie just a little further inside.
The maneuver snapped Charlie out of his euphoria, and he pushed in all the way to the balls in one smooth stroke. "Oohh, God!" Charlie exclaimed. He paused a split second, then began the long thrusts that squeezed every millimeter of his tool inside the unbelievably tight band of muscle. His fingers clenched rhythmically, pressing into Don's flesh as he rocked with the ancient rhythm.
"More," Don growled. "Harder. Deeper!" Charlie's cock was hitting that burning place inside when he thrust inward, but Don wanted more. He wanted it pounded mercilessly until the sweet fire consumed him and exploded through his nerve endings.
Charlie picked up the pace. He rammed his dick into Don's ass hard and fast, banging Don's prostate with every relentless stroke. His heavy balls slapped against his lover's as he leaned into his efforts. Don dug his fingers into the desktop, desperately scrabbling for purchase. His grunts of ecstasy mingled with Charlie's as he braced himself as best he could and pounded back as hard as he was able.
It wasn't long before Charlie couldn't hold back any more. He pulled out until the tight band was again gripping him at the ridge of his tip, then he exploded. White-hot fire shot through his veins as his balls pumped his seed into his companion's ass. Don let out a primal groan and came hard, joining his brother in blissful release.
Sweating and a little unsteady, Charlie pulled out of Don.
"Oh, wow," he panted breathlessly.
"Trick or treat, baby," Don grinned at him, panting, as he eased around and pulled him in for a loving kiss.
