"Of course it's because it was Regulus!" The words are flowing before he can stop them, and he lets them go because his head feels a bit fuzzy now and it's easier than trying to make them stop. Better to get it all out in the open now anyway. Better to come clean than keep up the lies that had gotten him into this mess in the first place.

"I thought you hated him, Sirius. Your whole family, I thought–" He goes to lift the bottle to his lips but stops halfway, for once thinking the better of it and instead holding it out to Sirius to take. He probably needs it about now anyway.

"You acted like he didn't exist. You wouldn't even speak his name. And then there I was, falling–" He cuts himself off again and drags in a ragged breath, shaking his head. "I thought you'd hate me for consorting with the very people you'd been trying to escape."