Why are you speculating on this? She stayed around occasionally whilst she was a child growing up. It's a family gathering and it's not her bedroom anymore the aunt has absolutely no reason to have to knock and ask to come in to a room that isn't being used in someone else's house when she was probably looking for OP

And maybe if you could read you'd see it was a bedroom she used to sleep in years ago when she was a child and stayed around

How tf are you getting downvoted? Who goes to someone else's house for a party, fucks off upstairs and has sex while everyone is still here. Like maybe if you were in college or something buts it's literally a family house filled with family members