Remus would have said something, really he would have and he probably should have but his brain was not getting any messages through to his vocal cords. All he could think was 'Sirius... Naked...'. That very intelligent thought was going through his mind over and over and over again. There was just no room for the more sensible thoughts about stopping this bloody madness.
The moment Sirius touched him, even though it was just a chucking under the chin, Remus' body got all hot and tingly and he knew he needed to get to some place private soon, his hard cock was not going to be willed away with any amount of willpower. It was needing touch, preferably Sirius' touch but Remus knew that was not ever going to happen, so his own touch would have to do... and it would have to happen soon!
The young wolf wriggled a little, but the friction that created only made things worse. He needed privacy and he really needed it soon. For now he bit his bottom lip to stop a frustrated growl to escape.