So , to set the story my boyfriend (18M) and I (18F) have not seen each other in nearly a week. Which doesn't seem like a long time, but we are used to seeing each other nearly everyday and having sex almost every time we hang out. So, naturally when we facetimed tonight things were a little extra flirty and ended up leading to phone sex, which we both have never had before. I though it would be fun, which it was, and it was good timing because I have been home alone for a couple of days and wasn't expecting anyone to come home soon. But once we finished up I heard something in the hallway outside of my bedroom door, so I look out the window and see my step moms car in the driveway. My stomach immediately dropped and I reflect on how there is absolutely no way she didn't hear what was going on. She probably even heard me from outside because I have my window cracked open. I was not holding back any natural noises I might make because duh its phone sex, on top of that I was using my loud ass vibrator. Who knows how long she was home for but it was certainly long enough. I am absolutely mortified and she is probably traumatized, I don't even know her that well. We will see what happens when i inevitably have to face her again.

TL;DR had loud phone sex with my boyfriend because i thought i was home alone but i was definitely not and i'm mortified and never want to see my step mom again.