Seal up the empty David suit

You zip the empty you-suit shut and put it on Jessica's bed. A few minutes later it's a copy of you, apparently alive and well. He wakes up and sees you and Jessica. "Hello, me," you say to him. "Do you remember what happened?"

"I'm sure I'm the real David Anderson," he says. "I suppose you're sure you're the real one too." You nod, and he sits up, shifts so that he's sitting on the edge of the bed, and looks thoughtfully at you. "Okay, I zapped myself with the brown pen, and then next thing I knew I was waking up just now. So I suppose I'm a duplicate of you, but I want you to understand that I'm sure I'm real, the real Dave."

You explain what the brown pen did and what you've been doing since his creation, and he says, "Okay, definitely I'm not the original. Anyway, so, cool, there are two David Andersons now. Now what?"

"We think that if we zap one of you and the other puts you on," Jessica tells him, "you two will combine back into one David who remembers having been both of you."

"That would be nice and tidy," says the duplicate Dave. "Neither of us dies, both our sets of memories survive, there's no distinction between original and copy any more because the result is really both. But I don't want to do that yet. So now what?"

"There's a nice empty Trish suit right here," says Jessica. "Maybe one of you can become Trish for a while!"

"It was good being Trish," you admit, "especially after I got her memories and self too."

"It was," says the other Dave. "You realize that one of us could put Trish on, get a zap from the brown "pen," and never take her off? Ever? And nobody would ever guess she wasn't the real Trish."

"We'd be murdering Trish," Jessica points out. "Sort of. The real Trish would no longer exist, just a perfect fake who remembered being Dave."

"Yeah," says your duplicate. "Look, this is just too tempting. Jess, zap one of us -- it can be me, I don't care -- and have the other put on the suit you get."