@ASLPro3D
This is just my take but once Terri's adultery is discovered, considering the Michael's characterization. He is definitely going to blame himself if the discovery is not handled very well. He is going to feel betrayed, in denial, blame himself, lose of self-esteem, etc. Adultery makes the spurned spouse feel powerless. He needs to be proactive in this event and take charge of the situation using his position of as head of the family and supernatural assistance of Syrina. It needs to be like a revenge fantasy (may involve violence that puts somebody in the hospital, a violent death maybe?, humiliation that maybe public).
Regarding Terri, I would not tap that. Stained goods. Possibly has an STI.
A guy on reddit I spoke with shared how he handled a similar situation. His wife wouldn't let him fuck her anally. But she let her fat married lover from work take it and even filmed it. So there are sextapes. He let everybody in his social circle know (his and her parents, fat guys wife, friends, people at the workplace) how much of a ho she was and the fat married guy. So public shaming. When she went back to her lover, he abandoned her. She was willing to leave him for fat guy because like Terri it was "love." So she went back to him after her realization, then she suggested he have an affair as well to get it out of his system, he dated and fucked three women in different instances in front of her as a condition of their reconciliation but ended up hurt since the women were very attractive. Some thought she was into voyeurism. She realized the error of her ways and how much hurt she caused him.
So for punishment,
- public shaming, let everybody know she a ho (especially Michelle since we are romancing her) and let the lover's wife know
- fuck women in front of Terri, if the lover's wife is hot, sex her too
I'd destroy the both of them...
My first wife was cheating on me when I was overseas, Jody had gotten my girl... some of my friends had told me this fact and it was a massive mind-fuck while I was doing what I was doing for Uncle Sam; all the while denying it when I confronted her on these claims, saying my friends just wanted to make us separate...
Like an idiot, I choose to believe her and put my trust in her.
I was a fool and learned this fact when I returned home one night earlier than planned and found her in bed with her "lover" who happened to be one of my best friends from High School... a guy who decided to take a 16 year friendship and destroy it by fucking my wife, 3 days before our 5th anniversary.
I pulled my .45 out of my waist holder and directed him to put on his underwear, telling her to stay in bed, that I WOULD return for her later and marched him outside in his underwear to my Impala; at which point I opened the trunk and had him pull out the tow strap and, as directed, began to tie one end of it around himself...
My intent was clear, I was going to hook him to the back of my car and take him for a ride!
That plan, however, was interrupted when my now ex-wife exited the house screaming and crying and proceeded to stab me in the chest 3 times with a knife... stunned by the action, I stepped further into the street and was hit by a car... had the police not arrived and I wasn't incapacitated as I had been, I surely would've killed the both of them.
After all, I've done far worse to those I didn't even know and whose only harm to me was shooting in my direction... but my ex and my friend, that was personal and hurt far more than those stab wounds, the busted ribs and dislocated shoulder!
So yeah, when it comes to the MC finding out about Terri's betrayal of him, there is going to be a bit of that anger in the story... along with the crushing blow, depression, self-doubt and self incrimination as well...
...and, any "punishment" he will take will certainly be felt and known, as well as, justified.
IF he stays with her, I sincerely think that it will only be as a punishment for her, to grind her down and hurt her as much as she's done to him...
...of course, the character may have other plans as well... as sometimes these things happen and the characters have a mind of their own... but yes, I certainly like and had planned something of those kinds of punishments
@HARiBON... perhaps not quite so much as you've suggested, but will certainly add those things in!
Thanks!