Considering how EVERYONE in the kingdom supposedly knows that the guy with the strongest seed has a bunch of women chasing after him, and considering how it's arguable over half the time he didn't consent or was in a situation where he was forced or coerced to have sex by circumstance, I think she'll not only forgive him, but she's probably well aware of him laying with the other women. Maybe she's a cuckquean and that's her kink or something, as we know she's the one who set it up so if he won the competition, he would be able to be engaged with her. @
PlanOfInaction
I can't be the only one who feels bad for MC, can I? Because Grill didn't want this, he just wanted to get married, but all these harem chicks are out there, borderline molesting him daily to unhealthy levels when he just wants to be engaged to his gf, as his psycho sister threatens to kill any cheating man and his son-to-be overprotective father-in-law will make his life a living hell as he tries to break them up. Not to mention, as soon as he gets married, those harem chicks ain't gonna just disappear. He's a victim of circumstance more than anything, it's like watching Odysseus trying to get back to Ithaca as he's held hostage by a bunch of women.
Unrelated note, but that obvious foreshadowing and exposition at the end is hilarious and borders on a 4th wall break.