Bum beads on one night stand

Last night I went to a club with some mates and got chatting to a lovely young oriental girl. We hit it off straight away and before long were in a taxi back to hers. Once in the bedroom she pulled out a rubber mat and layed me on it. She was sucking me off when I felt something go in my ass. At first I thought it was an adventurous finger but it felt a bit different. She whispered to let her know when I was ready to cum. Not very long after I was shouting "I'm going to cum!". As I ejaculted she ripped this long chain of beads out of my ass and I shit all over the fucking place. It was fucking magical!
It was always going to be a one night thing but I couldn't help wondering how it was all pre-meditated by her. If only all one nighters were like this.
My mates all think this is wrong, I think otherwise. What's your opinion, is it normal?

Do you think it's normal?

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