My mate's girlfriend just scratched and sniffed her arse - should I tell him?

Anon please, he's got an account on here. (Oh, nevermind :)) Anyway, I was on my laptop (still am obviously) and she was just across the room on the sofa, and our flatmates, including my mate and her boyfriend, were in the kitchen area so they couldn't see. She stuck her finger down the back of her pants and scratched her butt crack vigorously, and then she pulled it out really fast and sniffed her finger As soon as she had done this she noticed me looking at her and froze. Her eyes locked with mine and she just stared at me dead on. I gave her a weak smile and moved my gaze back at the laptop screen. I can't stop picturing the orgasmic look on her face as she took a whiff of her sweaty finger. I feel like I should tell my friend (her boyfriend) what I just witnessed. Should I?

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