Thanks for all your input guys. You're absolutely right about having to come up with a compromise rather than just blow off his request. It was rather immature of me to do, but when I first got my ecig I had a "this shouldn't bother anybody" mindset which caused me to feel spiteful about his request.
But he sent me a text message this morning before I woke up which I found quite ironic. He said he found the source of the overpowering smell, and it wasn't my ecig. Apparently his girlfriend came over and put a plug-in air freshener in the living room a couple nights ago. I didn't notice, probably because like a lot of us ex smokers, my sense of smell isn't up to par.
After I got up, I cut down some of my 54mg unflavored mixing juice and brought it to him, explained to him that it was unflavored and it's guaranteed to have no smell, and asked him if it was okay if I used it inside. He told me if he can't smell it, he doesn't care.
Funny coincidence though, what with the air freshener being installed the day before I hold a mini vape fest. I'll just keep away from my dark flavors at home, and anyway, this unflavored juice is quite nice. I agree with you cags. I used to vape unflavored juice a while ago, it's pretty good.