At Grimmauld Place - Sirius and James
Sirius was only slightly relieved when Regulus and Remus left to go back to the castle, he was glad that there wouldn't have to be any further displays in front of anyone else - and any on coming displays would be kept between him and James, the way he preferred.
"Merlin, next year remind me of this, I think I might need a break from pranks." He shook his head slowly rubbing the back of his neck, still tense even after things had settled, and it looked like this hadn't all blown up in his face completely.
Only a minor explosion, and considering both he and Regulus were involved that was to be expected.