What is the most believable Spilight scenario that could occur in the show?

2935043 Twilight telling Spike she loves him. And then background sex happens.

2935893 Well, we already know Spike loves her; he puts up with all her bullshit. If you love someone enough, you can (almost) put up with their bullshit. Plus, that whole 'repressed feelings' cliché is old and over used. It would be better if Spike never liked Twilight until they moved to Ponyville. Oh, and Rarity doesn't reject him, he rejects her.