You have a lady come in at least once a week to clean up your place because you're still recovery from an injury, and she usually comes on Saturday morning.
On Friday night, you were "hanging out" with some friends and you "lucked up," and met a young lady who came back to your apartment and spend the night. You were hoping that she would leave before "Chica" would come over to clean, but unfortunately she didn't and things got kind of loud (Chica hear what was going on through the walls).
Even though it's your place, you didn't want "Chica" to hear that and you ended up taking newly found acquaintance home on Saturday morning. However, upon returning you got a big surprise.
Chica was still in the apartment cleaning (at least you saw the vacuum was still out), but you heard some strange sounds coming from one of the bedrooms. When you went to look inside you saw "Chica," but she didn't see you at the moment.