so congratulations - in my reckoning most people are bi but grow up with societies conditioning.
If bith you and she enjoyed the xperience - and if you were both drunk but vividly remember it, then it must have been something special.
And you were not cheating on your bf were you if it was another girl - who knows he might be keen to take part in the future.
As to easier head - well yeah I suppose it would be, not so much mouth full.
Relax - my wife got really turned on when we first had a mmf - it's all good fun............