oh and ps.. grab my pillow covers to wash on your way out?

So I'm a girl and the best way I get myself off as crazy and embarrassing as it is is by putting a pillow in my pants and humpin away on my bed.. So one night, I could have SWORN I had locked my door. And I'm going at it when all of a sudden my mom walks in and turns the lights on. I threw the blanket over me but still had this large pillow tightly stuffed in my pants! Not only did she open the door, but she came in and sat on my bed wanting to talk and lay down with me! The whole time I was trying to discretely get the f***ing pillow out of my pants before she saw! I was completely out of breath and hot, and all I could do was quiver in awkwardness and complete mortification under the somewhat safety of my blanket and say "you scared me!" I still don't understand how she couldn't have seen or known!