and

Vi is lesbian and has loved Caitlyn for years, but feared to ruin their friendship and partnership by confessing her attraction. Caitlyn, bisexual but preferring men, has nearly led Vi along with the genuine kindness and intimacy she’s demonstrated. Jayce, straight and looking for a wife, dates and courts Caitlyn, who accepts his advances only after he curbs his pride.
When Caitlyn comes home one night, a diamond sparkling on her finger, Vi breaks down in tears and rage, having watched her love drift away. Caitlyn is shocked and asks for time to think, appreciating that Vi has been just as good to her as she’s been to Vi. She feels obliged to at least consider Vi, but forbidden by her agreement to marry Jayce.
Caitlyn emerges and tells Jayce what’s happened. Jayce is just as surprised, especially when Caitlyn admits she can’t live without Vi any more than Vi could live knowing that her love were in another’s arms. Jayce reminds her she promised to marry him, but Caitlyn reminds him of divorce. Jayce storms off.
Caitlyn comes home again and tells Vi what’s happened. Vi can see her honor has been satisfied but that her heart is aching. She tells Caitlyn that, although she’d wanted to settle down to a quiet life together, she loves her enough for an open relationship with Jayce. Caitlyn tells Vi that she deserves not to share her, but Vi insists Cait ask.
Jayce refuses. He wants the same quiet life Vi does. Caitlyn tells him how much Vi means to her, and asks that if he loves her enough to marry her, that he should want her and her loved ones to be happy. Jayce objects that Piltover’s laws prohibit marrying more than one person. Caitlyn says she remains still his fiancée, and that Vi would not be legally attached.
After discussing kids and property and financial planning, Jayce agrees. They file for their license as husband and wife, but at the ceremony, the three stand at the altar, agreeing to form one family of two loves.