Hello,
Wanted to leave my two cents on your story so far as I just got caught up in the course of a few days of reading. I like it a lot, you aren't the best writer from a technical perspective (most of us aren't) but your ideas are phenomenal. You're a fantastic storyteller and that is what really matters in my opinion. Great stuff, I'm going to eagerly await your next chapter.
I'm glad I kept reading, I thought it was rather jarring when the perspective switched after Dan+Mark got infected. I felt the story was self contained enough with their 'deaths' but I like how you tied it all back together and reintroduced them.
As a side note I find the idea of love transcending sexuality to be very romantic and also uniquely 21st century. It's interesting. I mean Dan and Mark clearly love each other, it's a romantic love on both ends but it transcends sexuality. Very cool.