Long-term? Harry smiled to himself, wondering if Regulus even realised how he was speaking of a relationship that Harry thought was only a few weeks old. But the anxious tone that Regulus used to ask his questions brought Harry out of his amused thoughts, and he gave his questions careful consideration.
"I think Sirius is the only person you need to worry about offending, and he's gone." The last word came out rough, but Harry cleared his throat and continued. "Sirius wanted us all to be happy. I think it would make him pretty pleased to know his brother and the lover he left behind could make each other happy. He'd like the symmetry, I think. He was always looking for things like that."