[M]y younger sister almost caught me cumming in the ex g[F]’s mouth

Let me give you some background real quick. I’m 18, 6’5, and a Senior in high school. My ex gf was also 18 and a senior, but was only around 5’6. So there was a bit of a height difference which had its own set of problems but they don’t matter to this story.

Ok, so I am a very shy person by nature, idk why but I am. So I had never really talked to any girls during high school. I usually just hang around with my friends, play videogames, and compete in sports. So having my first girlfriend was a big change of lifestyle for me. She was very nice(but had a lot of emotional baggage I did not know was there which is what eventually led to our breakup), and she asked me out. So, of course I said yes, dream come true for someone too scared to ask a girl out to have one ask them out.

Fast forward about 3 months

She had asked to come over after school one day and had asked if my parents were going to be home. (My parents would be home around 4:30 and out school gets out around 2:30) So I said no.

She comes over and we start making out(which is as far as we had gotten by then because I was still shy and wanted the relationship to go a bit slow) when she straddles me. She usually does this when we make out so it was nothing unusual, you know some teasing, making out, repeat. Until she gets off of me and pushes the coffee table away from the couch(My couch in the basement has a coffee table infront of it so we can set things down when we watch movies and stuff). I knew something was slightly different in the atmosphere. Then she gave me some puppy eyes and asked if I wanted some head. This took me a bit off guard, but of course I said yes.

Let me give you a layout that would be the problem in this story. The staircase that leads down to the basement is directly on our right, like 10 feet away. And to the left is a work room with the fridge, everyone has the garage fridge or the basement fridge. But there is a door at the top of the stairs that was closed so we couldn’t hear anything on the floor above us.

Back to the story.
So she tells me to pull out my dick(This was a big step for me because I haven’t shown anyone my dick ever). I started to unbutton my pants and pull them down until I was in my underwear. I was reaching for those too when she said, “Stop, I wanna do that part” she began to caress my dick a bit through my underwear and finally reached inside them and grab my dick. When she did I got goosebumps across my entire body. She pulled it out and got a good look at it. My dick was a good 7.5in but was not so much on the thick side, which always made me very very self conscious. She said, “Fuck” in like a half moan and that instantly made all my fears go away. She looked me straight in the eyes and said, “Ready”, “Yup” and she dove straight down onto my dick. I never in my life had felt something so amazing. The way she twisted and licked my dick felt unbelievable. I was basically brain dead while this was happening. She could only go about halfway down my shaft before she would stop, which was a bit of a bummer but also a bit of a confidence booster in a way. Then she pushed as far down as she could until my dick literally popped into her throat. That felt sooooo much better than the normal head. This went on for about 20min until I told her I was ready to cum. She told me to just do it and not hold back. This was a dream come true for me, as I had always wanted to cum in a girls mouth while they were sucking me. About a minute after that I told her I was cumming and she went as far as she could and I started to cum deep in her mouth. Only one rope got that far tho until I heard someone open the basement door and start running down them. It scared me so much that I pushed her head down all the way in order to hide her from the video of the stairs. Doing that backfired as I was still cumming, but no longer in her mouth, I was now cumming in her throat. I was holding her head down while I was letting out slight moans of pleasure while looking at the stair as my younger sister was standing at the base of them. Luckily for us she turned and went into the other room to grab a soda. The second she disappeared I let go of my gf’s head and she instantly pulled off of my crotch and started to cough. I pulled up my pants as fast as I could, just then my sister asked if I wanted a soda. I said no because I was still a mess. Not ily was my heart pounding from an orgasm but also the fast that my younger sister had almost caught me doing so. She then closed the fridge and went back upstairs. I told my gf I was sorry for holding her head down and she said it was ok. Then we looked at each other and laughed about that ridiculous encounter we had.

The end.