Personally, I'd put one portal in my wardrobe, and the other in Narnia a jumbo jet's bathroom, cleverly concealed on the ceiling, because seriously, who looks up when pissing on a plane? I'd conceal it carefully. Back to the point, I could get a free jet ride to wherever it's going, which would be nice.
[General]
I look up, I like to uh, survey my surroundings, and when I pee I look up in relief. You should try it sometime. It's very therapeutic.
Relevant
{General}