Beast Boy scrambled onto his bed, transforming back to human form. He was breathing hard. It had been an instructive night, if only by observing Robin's extreme flexibility. Beast Boy could see it again in his minds eye — the Titan curled up on himself, his cock pistoning in and out of his mouth. He recalled the final moment, of Robin's cock pulsing as it unloaded its discharge into his own mouth. A shiver went through Beast Boy's body, and he had to concentrate to keep himself all human.
Beast Boy's mind went further back. He remembered when Robin had intruded on him when he had been watching porn. Beast Boy's had instinctively turned into a mosquito, buzzing to a corner as Robin had entered. Robin had looked around the room, then focused on Beast Boy's computer. Beast Boy's had watched in trepidation as Robin had pressed buttons. Then Robin's face had gone white. Instead of rushing out of the room, Robin had stayed, staring at the screen as the movie played. After a few minutes, he had hurriedly pressed more buttons and left the room. But Beast Boy had already seen the bulge in his pants. Beast Boy had returned to his human form, and stepped out just in time for Robin to walk past him. The other Titan had mostly regained his composure, but his eyes were wild.
Since then, Beast Boy had snuck into Robin's room to watch him play with himself. It was better than porn because it was live. This night had been no exception. Robin had progressed a lot in the last few months. Beast Boy had never seen a pornstar take his whole cock into his mouth; he should recommend that Robin go into porn himself.
Unconsciously, Beast Boy slipped his hand into his pants, his long fingers curling around his cock. It hardened under his touch. He let out a low moan, and quickly stripped out of his clothes. Now naked, Beast Boy stroked his cock, blissfully. He closed his eyes, imagining Robin sucking his own cock.
That was when Beast Boy heard the door to his room shut with a quiet click. Immediately, his hand flew to his groin, to cover his nakedness. He opened his eyes, and saw Robin standing in the door, fully dressed in costume.
"R-Robin", Beast Boy said in shock. "What are you doing here?"
"Good evening, Beast Boy", Robin replied formally. "I can see you're using your free time productively."
Beast Boy flushed as Robin's raked over his body, taking in his barely concealed cock.
"Go away!" he said angrily.
Robin raised an eyebrow.
"You don't like an audience?" he asked sarcastically.
Beast Boy didn't reply. He just glared at Robin. Robin took a step forwards, standing at the end of Beast Boy's bed.
"Well, I do", he continued with a predatory grin. "And it's been so good of you to oblige me."
Beast Boy paled. Robin was implying that he knew that Beast Boy watched him as he jerked off. But how could he?
"I don't know what you're talking about", Beast Boy stammered.
"I learnt a thing or two with Batman", Robin replied with a wry smile, "and one of those was noticing things that aren't meant to be there." He paused. "You didn't think I wouldn't notice a pair of eyes staring at me each time I jerked off?"
Beast Boy didn't respond. There was nothing he could say. Robin reached down, and pulled Beast Boy's hands away, exposing him in front of the other Titan. Robin jerked Beast Boy's cock once, causing the green Titan to gasp loudly. He scrambled back.
"What was that for?" Beast Boy asked.
"You've been watching me all these months", Robin replied. "It's only fair that I get my fair share as well."
Robin climbed on the bed with Beast Boy, and pulled him onto his lap. Beast Boy wanted to protest, but found that he couldn't. He just let himself go with the flow. Slowly, Robin jerked him off. Beast Boy could feel Robin's cock through his costume, hard again, although he had just cum. Beast Boy shivered at Robin's touch, which was firm, yet gentle. Robin seemed to know exactly where to put his fingers and to twist his wrist to give Beast Boy the greatest pleasure.
Finally, Beast Boy moaned.
"I'm about to cum!" he said.
Robin pushed the other Titan off his lap. Beast Boy sprawled on his bed, precum dripping from his cock.
"What was that for?" he complained.
"I'm not done with you yet", Robin replied. "Lie on your back", he ordered.
Beast Boy complied. He felt like he had to. And also, Robin's hand had felt so good on his cock.
Robin lifted Beast Boy's legs in the air, pushing them over his head. Beast Boy could see his own cock not too far from his face. However, he wasn't as flexible as Robin, and his cock remained out of reach. Robin tried to push Beast Boy into position, but he just couldn't move that way as Robin could.
"Can't you make your cock grow larger, or something like that?" Robin asked in exasperation.
Beast Boy closed his eyes, and concentrated. His cock grew longer and thicker, surpassing even Robin's cock. Beast Boy just couldn't help showing off.
"Like this?" he asked smugly.
"Perfect", Robin replied. "Now, open your mouth."
Beast Boy did as Robin said, although he knew exactly what Robin wanted him to do. It as quite obvious by now. Robin held up Beast Boy's monster cock, and placed it on Beast Boy's tongue. Beast Boy could barely fit it into his mouth.
"I think you overdid it a bit", Robin muttered.
Beast Boy shrugged as best he could.
Slowly, Robin jerked Beast Boy's cock with one hand. It barely fit around the cock. Robin shook his head in exasperation. Then, Beast Boy felt something cool press against his asshole. Somehow, Robin had found some lube, and was now pressing a finger into Beast Boy's hole. Beast Boy tried to protest, but couldn't say anything, due to the cock in his mouth. Robin pressed his finger deeper into the green Titan, finally reaching a bundle of nerves within him. Beast Boy shuddered. It felt like bolts of electricity were shooting throughout his body. He felt a bit lightheaded. But the majority concentrated on his groin.
Beast Boy let out a loud groan, and came. He was unprepared, and choked on the first jet. Robin pulled Beast Boy's cock away from his mouth, but all that happened was that the cum landed in Beast Boy's face. Robin let go of Beast Boy, who slumped on the bed. His cock shrank back to its usual size. When he had the strength to wipe the cum from his eyes, Beast Boy saw that Robin had left, without making a sound.