我看到我的岳父和我的岳母发生性关系

On one of these days, I arrived earlier than usual at my girlfriend's house and ended up delivering my in-laws to the living room sofa. I already knew that they had a very active sex life, but I had no idea that it was in this intense footprint that I ended up witnessing, where she even asked to receive creampie in her mouth at the end.