Mmm, yes, that was perfect. Every move Sirius made was creating little groans in Remus' throat, all of which he was trying to hold back. He wasn't as vocal a person, but hell it felt nice, even when his skin was ripping. The pain actually made him let out a moan as it was paired with intense pleasure at the same time; he would have absolutely no problem with thoughts of his back belonging to Sirius, especially not now.
Remus was too enveloped in Sirius' mouth to notice what was he doing but then, oh god, he was feeling along the premade scars. He never thought those would be a turn on, definitely not for himself, but here he was, lips falling slack against Sirius' because of the moan pushing its way out. His feet began moving forward, trying to push them even closer together as if that would suddenly remove all fabric left between them.