I love it. Very mysterious! It got my heart pumping in anticipation. I wish there was more.

Hehe, I actually really liked it. The ending...I'm not sure. Something about it just doesn't feel right. I like it...but...I don't know.

The rest of the story though: Just a little bit humorous, just a little bit disturbing, and all in all one very entertaining. I love the voice of this story.

'They only one' - 'the' for 'they', maybe?

I thought this was told quite well. It kept me reading.
I'm not exactly sure why the suicide pact was carried out, though. Why would Oz propose to his girlfriend if he really didn't want to be with her?
Or is the narrator really not supposed to be trusted, that when he said 'he’d rather die than be separated from me' she took it literally and decided to kill him? Sorry if I'm over-complicating things, but I'm curious. =P

I thought the ending worked quite well - it's pretty creepy, which I like.
One thing I was a little iffy about was the '(coughincestcough)' part, because I thought it distracted from the writing a bit. I'd take out the 'cough' part and figure out another way to phrase this. Maybe 'incest, in other words'. You can probably figure out a much better phrase, though.

Great work, all in all!