I was trying to be helpful when I last posted but to be honest, as Azure says, if the baby does not look anything like the bf (and babies have an uncanny knack of looking exactly like their daddies)then you are in awkward territory.
It sounds as if you are the type to blow hot then cold over your lovers. Therefore, once the varnish comes off bf again (as it did before mate was bedded)there may be a heated argument where you blurt out 'You're not the father'.
There is also a possibility this child may find out themselves their father is not who they thought it was. So you could potentially ruin 4 peoples' lives completely not by this one drunken antic, but by being dishonest.
As you have already different morals from many of us trying to help you, dishonesty and ruining peoples' lives might not be so bad if it saves your own skin for the time being. Which is why I suggested it, and you took the bait and thought it not a bad idea.
At the end of the day, as I said before, babies are precious and you need to look after yourself. But try to think what would be best for your baby and the men in your life too (if you can).