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I think it is a difficult one to identify. Anyway I will go with the "Black slug" option.
Sorry for the late update!!!
You are totally right, Ava T-B
Thanks!
Well, it seems the moray liked it.
But you are right... No touching please!
Thanks Bernadette! I will do that :)
Thanks Alice and dandoucette for your help.
I was there like 10 minutes making pictures and 'it' didn't move at all. Taking a look to the dandoucette spotting I can see this should be 2 slugs mating... But, of course, I am not 100% sure :-)
Thanks for the info!