Marco could hear him. He heard Jean's gentle pants and quiet gasps in the bunk below him. He knew it was wrong to listen, but he couldn't help himself. Marco stared up at the ceiling as he heard Jean's quick breaths growing louder, closing his eyes as he felt his own groin grow hot. No way. He was not getting off to this. He tried to direct his mind away from the noises Jean was making, but to no avail. His erection only grew larger, stretching out the front of his boxers and causing immense pressure in his stomach. Finally, Marco couldn't take it anymore. He needed Jean, and quickly.
Marco swung his head over the side of his mattress, smiling as calmly as he could down at Jean. "You're gonna wake everyone up with all noise you're making," Marco joked. He heard Jean gasp and turn away from him.
"M-Marco! A little privacy?" he stuttered. "H-how long have you been l-listening?" Marco began to feel nervousness claw at his chest. Maybe this wasn't such a good idea after all.
"I-I thought it was kinda…cute?" Marco stammered in return, looking away from Jean. Jean's face returned to its usual grimace.
"Just go back to sleep," he huffed. Reluctantly, Marco obeyed, mortified and angry at himself.
What did you expect him to say? Marco thought bitterly. He lifted himself back onto his bed and closed his eyes, sighing softly. However, it didn't take too long for those beautiful sounds to return again. Marco wasn't going to let them slip by this time. Silently, he reached into his boxers and wrapped his fingers around his own hard cock, suppressing a gasp of pleasure. Focusing on Jean, he began to stroke himself, careful to keep as quiet as possible.
He imagined himself coaxing those wonderful noises out of Jean, touching him and kissing him all over. He imagined Jean returning the favor, wrapping those soft, thin lips around his-Oh.
Marco could feel himself getting close. He stroked himself faster, closing his eyes and moaning. He didn't care if Jean could hear him. He didn't hear if anyone could hear him. All he knew was that he could hear Jean and it made him so fucking horny.
That was when he heard it: a final loud gasp from Jean, followed by a quiet whisper of "Marco". Not Mikasa, not even Annie. His own name. Marco couldn't take it anymore. He came, a dark gray stain spreading in the front of his light gray boxers. He mouthed Jean's name as he came, feeling his orgasm rush through him. With a sigh, Marco turned over and fell asleep, barely worrying about the stain in his boxers.