- After I do the exposure. Should I come back home and face her right away?
Just go about your usual busines. There is no reason to change your routine.
I'm afraid she might retaliate in a very aggressive way.
Such as? Will she beat you? Is she bigger than you?
In the other hand, I feel like I need to be there to gage her reaction and address whether this is recoverable or go to plan B right away.
You will not and should not make any plans in reaction to her response. She will be ENRAGED that you interfered with her affair. THAT IS AN EXPECTATI0N. You will not get roses and kisses for exposing. The rage is expected and temporary. You just wait until blows over and hope that she doesn't beat you. If she beats you, call the police.
- What should it be my inmediate course of action after exposure?
Do what you would normally do. When she confronts you with fury, say "I am sorry you are upset. Would you like a potato chip?"

You will not be able to reason with her anymore than you could reason with a crackhead who just had his crack pipe removed. Don't reason with her, and do not allow her to bait you into a fight.
- The OM is 35, should I still expose to his family?
OH YES. This is a powerful exposure because it RUINS the future prospects of the affair. Your W and the OM may be fantasizing about her integration into his family. This will ruin that prospect.
It is good to do all exposures on the same day if possible. That way there is tsunami effect that gives them no opportunity to regroup. Nor can they pre-empt you and spin the story.
Exposure targets should be:
1. OP's spouse, if any
2. WS' parents, your parents, the OM's parents
3. Human Resources if a workplace affair [we have a great letter]
4. your CHILDREN - your kids should be told the same day so they can be prepared for the fallout. You will have to give them moral guidance or they will be left vulnerable to the immoral guidance from the WS, who will teach them that wrong is right
Family members should be approached with these talking points:
1. WS is having an affair
2. I am trying to save my marriage
3. What would be your ADVICE? <-----be sure and ask this, it motivates them to become involved
You HOPE that these family members will call her up and persuade her to stop her affair.