Something stuck on my mind is a Yandere male just frothing at the mouth almost when at an event with his beloved. They don't even know anything wrong is happening, they just see his smile go tight and his hand comes to hold their waist, pulling them closer as he "politely" says they need to leave.

Once they're in the car, he puts it in park, and just glares at the windshield before saying. "I can't believe you let them talk to you like that. Saying all that nasty, vile shit about you".

They're caught off guard, confused and concerned, asking what he means, what's happening, because the party went so well in their eyes! And he hides his smile, one hand beginning to rub at their thighs as if to soothe them, but it's really to ground himself, to remind himself not to fly off the deep end entirely just yet or he could lose them in the process.

"Oh baby...You're so sweet...You really had no idea?" He begins, and spews so many lies about what they said, how they said it, how they laughed behind their backs.

His beloved believes every word. Falling even deeper into his trap and becoming closer to being the way they're meant to be! His stay at home spouse, who never shows how perfect they are to the vile rats outside, who only wish to do them harm.

(But it's not like he couldn't kill them if they tried to take his darling away )