Happened to me in college. Sleeping in the bed with my then girlfriend, she was out cold, the roommate came into the room so I pretended to be asleep, peeking through one eyelid. Roommate got changed (but faced away from me!), and stood over me for a long time before lifting up the sheet, looking at me (I was naked), then climbed up to her bunk. I never told anyone, not even my g/f at the time. My current wife knows, though, but she doesn't know the other people involved.
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