Greg just took a long drag from his cigarette. Bad habit he knew, but he didn't care. He merely nodded. He could tell them about things, but not advise. It was their fate to decide.

"It will not. You two have bound yourselves together as Hades and Persephone, whichever mantle of version you choose to be is your decision. For all intents and purposes, you two are just as married as Zeus and Hera. Though, that might not be the best description. Though Sherlock should buy you a ring John, make an honest man out of you." He winked and then vanished.