For a few moments Remus stayed on his bed, he wanted to make sure his friends were really gone before he got up and made his way to the showers. He turned on the water and quickly undressed, he locked to door and put a silencing spell on it. He needed privacy, he looked down his skinny body at his hard cock. "Sirius..." He moaned softly as he got in the shower, he wrapped his hand around his hardness and squeezed.
For a little while he just stood there with his eyes closed, letting the hot water warm him, just holding himself thinking of Sirius, but then he started to stroke himself, in his mind he saw his friend's beautiful face with those gorgeous eyes. He pictured the dark-haired Gryffindor's hand, he had looked at them often wondering how they would feel stroking him. If he was an artist he would be able to draw those hands from memory, at times like these he used that memory to pretend that it was not his own hand but Sirius' hand on his cock.
He wouldn't last long, he never did when pleasuring himself. "Sirius..." He moaned as his hand stroked harder and faster, he leaned with his back against the wall bringing his second hand to his balls. He wondered if Sirius' hands would feel like this or if they would feel better. He decided that those divine hands would feel so good that he would not be able to imagine it.
He stroked harder and faster while playing with his balls. "Sirius... I need you." Tears ran down his cheeks, he could never ever let his friend know how he felt, what he did, what he fantasised about. He kept pumping his cock and as he had expected he didn't need much time to cum. Orgasms should be a good thing and even though physically it felt good to get this release his heart hurt.
While trying to catch his breath the warm water cleaned away any prove of his secret feeling, fantasies and desire. The same water also hid the tears of longing falling from a sad boy's eyes.