"So, I'll warn you ahead of time that you might want to say no to this question. OK?"
"Do you want to know about my crazy new relationship?"
"OK, I wasn't kidding. You might want to say no."
"Why wouldn't I want to know?"
"It's pretty, umm, nontraditional."
"Haven't your relationships always been nontraditional?"
"Well, yeah, but not like this."
"OK, tell me."
"I have a new boyfriend... and a new girlfriend. The three of us are having a grand good time together."
We talked about it for a while. The bottom line: "I told you a long time ago that if it makes you happy, that's fine. I don't have to like it, but as long as you're taking care of yourself I'm OK with it."