A few years ago I was attending a week-long seminar in Chicago which started early each morning and went the whole day. On the last day of the seminar we ended early so I went back to the room preparing to check out.
I stripped down to change into travel clothes and felt horny after being away from my wife for so long. I decided to go into the bathroom intending to masturbate to orgasm, my first time in years.
Whether I was oblivious to sound or the maid did not knock very loud, I did not hear her enter the hotel room. I believe one of the first things she did was go to the bathroom to pick up the wet towels. She barged into the bathroom without knocking as I was standing over the toilet jacking away and about to come. She said 'sorry' and closed the door. I immediately lost interest in what I was doing, feeling totally embarrassed.
I waited a few minutes before I came out of the bathroom and found the maid still in the room quietly making the bed. I was totally nude and ran back to the bathroom.
She followed me and asked if she could get the wet towels and bring me new ones opening the door slightly. I told her 'okay' then she pushed the door open all the way came in and started picking up the towels.
She looked down at my cock which was still semi erect and said, 'If you haven't finished yet, you go right ahead if you want to and I'll wait.' Then she turned around and went back to making the bed without closing the door.
I was somewhat turned on by all this and wished she was a young woman instead of one that was slightly older than me. After a few minutes she came to the open door as I continued jacking. She stood there with a towel in her hand and said nothing, just watching me. I came with a full load to which she said, 'Feel better now?' as she handed me the towel to clean up. I whispered 'Yes' and left her a big tip when I checked out later that day.
In retrospect, I expect she knew what she was doing to earn that tip.