"Hmmm. Alright, I can do a hidden one, I don't want to trap you if something terrible happens. Now, the caveat with portals is that I need to physically go to where each side will be, and leave a sort of magical marker so I can tell the portal where to go."

He thinks about the logistics necessary. "I can place a marker here, teleport to my plane alone, wait for a little while for my magic to be ready for a portal, then let you know on a mirror and you can just come through then?"