Very abbreviated concept, but please consider the classic “Charles gets dosed with a love potion” - but the person the potion latches onto isn’t Edwin, it’s an amateur potioneer with a crush on him and no respect for consent. And it works, fully, Charles is madly in love, sobbing and composing sonnets and proclaiming everlasting devotion and all the rest. He tries to stay with Edwin, but the draw gets too strong as the potion takes hold, and he runs off into the night to meet her.
And then, a few days later, Edwin gets to them, and tries to rescue Charles starting with taking down the potioneer, and the potioneer commands Charles to protect her from Edwin. And Charles freezes, and stares at them both. And then, face covered in tears, slurring apologies, he knocks the potioneer out from behind.
Edwin gives him the antidote, and his eyes slowly clear, coming into sharp focus on Edwin.
“Charles? Are you alright? How do you feel?”
Charles keeps staring, for a bit, eyes fully focused now but brow furrowed, and Edwin gets more concerned, if possible.
“I… I think I feel… I think. No. I don’t think, I’m quite sure. I love you, Edwin. Like, the way you love me. I’m in love with you.”
Edwin lets out a breath like he’s been hit. “Oh.”
He looks back at Charles, hands moving spasmodically through the air, reaching towards Charles and then back again. “I’m so sorry, Charles. I must have failed with the antidote, it must have altered the parameters of the potion instead of ending the effects, I - just give me an hour, I’ll find out went wrong and remedy it, I promise. Don’t worry, I’ll fix it, just - “
Charles surges forward and grabs Edwin’s erratic hands from the air. “No, that’s not what I’m saying! I’m saying - I’m saying that even when the potion was working, and I was madly in love with that bint, I still loved you more. I had to go with her, I couldn’t stop myself, but I still loved you more. And I always have, Edwin, the whole - the whole drunken giddiness or whatever that it did to me, the obsession, it’s nothing to what I’ve always felt for you, I love you so much - so much bigger - than that potion. I love you, Edwin.”
And Edwin looks at him, again, still, eyes wide, hands held clutched in Charles’s, and speaks again, and this time it sounds like a breath let out after having been held for decades. “Oh.”