I can hear my dad and step mom having sex? What should I do? Its nasty af?

I'm 15. I was upstairs playing Just Dance on the wii and the TV volume was pretty loud. I came out of my room to go get a drink downstairs and notice my parents aren't in the living room anymore and their bedroom door is shut (this was around 2:20ish) . I have a 19 month old little brother who is currently napping in the room next to me. I heard my parents door slightly shaking, a bunch of fast smacking, the bed bouncing, my step mom moaning and I heard my dad grunting. There was also a weird smell by their door. (I walked past their door to get to the kitchen). It's was so gross, they are so loud! The smacking won't stop either. I just went back down again to return the cup and there's was no smacking but my step mom was still moaning and I heard footsteps and the smacking started again as soon as I came back up the stairs.. Its 2:47pm. EWWWW! I was making loud noises while slamming the cabinets, coughing and stomping up the stairs but they are still going at it. I don't know what to do!! This is gross!!!
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Guys, its my step mom and dad not my actual mother lol. I'm usually out every weekend with friends, however I went out on Friday and my friends are busy today. I dont know why they are doing it right now. They are still doing it and its 3:08pm... ugh
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I can hear my dad and step mom having sex? What should I do? Its nasty af?
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