Sirius was barely holding on as it was, but with Remus squirming like that, writing underneath him as his orgasm ripped through him, Sirius couldn't hold on anymore. Letting go himself with a sharp gasp, he dipped his head down, burying his face into Remus' neck as his own orgasm overtook him with such force he had to cling to the boy beneath him in order to ride it out, Remus' name tumbling from his lips several times over.