Molly spends the night up here and we swap them in the morning. Molly runs down the stairs then when she's at the bottom I plop him down and he runs up. Recently I've started holding dragon like burger up to her on her way down so they can sniff one another fully without actually touching (minus some gentle boops). Every day we take a few moments longer together. This has made more difference than anything else we've ever tried. I'm excited!