Number Three - Adult Situations

WARNING!  If you are a member of my family, please stop reading now!  This is not intended for you.  If this is something you absolutely have to know about, just ask me, and I might tell you.  If you're still reading, I will ask once more, please stop now and don't betray my trust by continuing further.

So, as you may remember from my previous post, I was feeling a little over my head with Number Three, but I was making the best of things.  I had quite a memorable birthday that year, in the company of Number Three.  My sixteen year old self would have described it much better than I could today, but this story is embarrassing enough without my hyperbolic teenage love poems, so I'll spare you from all that nonsense.
Then came the night that changed things:  New Year's Eve, 2000.  My family had a small party with the family, and I had somehow convinced my parents to let Number Three spend the night at our place.  I'm still not sure how I managed this, but that was the situation.  Being the gentleman I am, I offered her my bed to sleep in, and I would sleep on the couch upstairs.  I don't remember many details of the party, because I had other things on my mind.  Number Three and I basically spent most of the evening staring at each other on the love seat, and generally ignoring whatever conversation was going on.
Eventually, when the guests left, we retired downstairs to my room, which didn't have a locking door.  (remember this for later!)  We spent a few minutes playing some board game or other, until our throbbing, biological urges caused us to start furiously making out.  After a few moments, I thought I heard a knock at the door.  I ignored this and made out a bit longer.  Eventually, I decided to check to see if someone actually  did knock.  I checked, and no one was there, so I got back to the good stuff.
The makeout session was starting to get intense, so this was where my rational brain decided to speak up:
I'm sure you're enjoying yourself, but you are aware that there are some potentially serious consequences--
This is where my animal brain cut in and said something like this:
There is a girl here.  She wants me.  This has NEVER happened to me before.  EVER.  I am NOT going to let you screw it up for me now, so why don't you just shut up and take a step back before you get hurt, C-3PO?
So, being rational, and not wanting to get hurt, my rational brain decided to stay quiet and out of the way.  This allowed things to escalate to degrees I didn't think were possible.
That was about the point where things went horribly wrong.  A certain member of my family opened the door, (remember, no lock?) and saw the two of us in what I can only describe as an 'adult situation'.  The door was closed again much quicker as the panic set in.  Number Three quickly bailed off the couch and pretended as if something else was happening, but I knew that we'd already been caught.  In retrospect, I think this was a sign that she'd been in this sort of situation before.  After a tense few moments, I was called upstairs to get the talking-to of a lifetime.  I was in more trouble than I'd ever been in my young life, and I knew it.  Thankfully, my brain has shut out the exact words that were said to me.
After that, Number Three sat together and watched a movie briefly, but there was a serious awkwardness that hung in the air into the next morning.  I still sort of felt in love, but this was really the beginning of the end...