When I first was collared by Master, I also had a Sir in r/l. The three of us had an understanding and an agreement that Master's orders were secondary to Sir, since Sir was my primary Dom at that time. It was difficult at first, but the key to making it work was absolute communication...if I had a task for one, I had to let the other know. If there was any conflict whatsoever, it was my duty to inform the other. And as for time...it all fell into place, really. I had my curfews, I was allowed playtime with both...Sir, Master and I made it work. Sir and I have since decided that our D/s relationship wasn't satisfactory...which resolved any conflict that existed between my two Doms and me. Would I have changed anything? Not in a million years.