Yesterday one of my colleagues who had an experiment going had to leave the office for a&e because they had a kidney stone attack. He was in the middle of an experiment ( we have a lab) so another colleague and I told him not to worry and that we'd stay and deal with everything.
We managed to mess up a timer which meant we needed to stick around until 4 in the morning - no impact on results - just a pain re waiting - couldn't leave as H&S rules dictate at least 2 people must be present if lab material is in use.
We're friendly and get on well so we finished our work for the week, ordered food, had supper (no alcohol), watched a film and tried to get as comfy as we could on the only soft furnishing there is (head to tail on a long Fatboy sort beanbag with our feet hanging off ) whilst we waited it out. We must have moved around a bit whilst we were asleep as when I woke up I had my head on colleagues thighs - and he had an erection, which I know because my hand brushed past it whilst trying to get off the bean bag.... This woke him and he seemed mortified. I didn't mention it, he didn't mention it. We got up and logged everything we needed to log and both got taxis home.
I am right in thinking that the best course of action is just never to mention what happened ever again? Or should I mention it to him and just say I'm fine?