[MF] I fucked my gf while her mom was home

So first time writing something like this. In college, I and my girlfriend lived 5 minutes from each other during summer but still with our parents. Out of nowhere one day, she sends me a text saying, “I’m home alone and I really need some of that big black cock.” I instantly hop in the car and drive over. I open the garage to see her waiting for me in some flowing booty shorts and a sexy crop top that squeezed against her beautiful tits, letting me see her hard nipples. I pulled up wearing some grey sweats with no underwear and a black tank that was tight enough that you could see my abs through the shirt. I stepped out of my car, making sure to make extra movement so she could watch my BBC swing around in my pants. She noticed because as I was walking up to her, the only thing she could look at was the huge bulge in my pants.