Input Title Here

{{Nsfw}}
So I'm sitting in my room at my mom's house dominating my friends in social matches in Halo 3 when I get a call from one of my friends.
It's Kat, crying, no, sobbing into the phone about her butthead of a boyfriend cheating on her and her walking on it happening.
She says she wants to come over because she needs someone to talk to and I asked why she couldn't just talk to me on the phone and I'm in a really good game right now but she insisted so I was like, ugh fine!
Anyways after about 20 minutes or so she arrives at my window, and I open it and plan on talking to her from there but she hops right on in completely uninvited!
Well, she's walking around my room and slowly starts taking her clothes off.
I'm like whoa, what the fudge is going on.
She walks over and tells me that it would be a huge blow to Daniel (her bf, ex bf?)'s pride if she were to sleep with me.
Okay, mind you, this girl is 16.
I am 23.
This is all so awkard but she has a really nice body so I didn't really have any quarrels except one thing.
I'm a virgin.
I have never been touched, EVER except accidentally by sister one time. (long story aint talkin about it!)
I am nervous as heck and she starts reaching her hand into my pants and almost touches my wiener but I pull away.
She giggles and gets completely naked and hops onto my bed and gives me a 'come here' motion with her fingers.
I nervously walked over and take my pants off, I am not the most well endowed person ever so my already erect wiener is pretty small, but w/e, girls don't care about size, I hope.
I slowly inch towards her my wiener so close to her vaginal opening, I could feel the sweat on my brow, my heart racing.
I enter her and all went well...
for about 4 seconds and I completely lose it.
I blow my entire load in her, completely unprotected, just ejaculated entirely inside her.
I look at her face in astonishment as she then pushed me off of her, searched for her clothes and jumped out the window, with an obvious face of disgust.
I am so mortified, what do I do?
Do I apologize?
Am I going to get in trouble?
Please help!