Jean hisses a little behind his teeth. He knows this could be enough to get Eren off, but it could be better. He tightens his fingers where they're entwined. He rocks his hips forward, and then holds them there.

"Show me how you want it," he tells Eren - demands that he fuck his mouth on Jean's cock. Making him an active participant in his own debauchment is always fun. If Eren wants to fight him on it, there's plenty of delicious ways to punish him for it.

But for now, Jean tries to encourage it by tilting his foot up a little, pressing Eren's balls closer to his body.