(after the Grand Galloping Gala, in the garden)
Applejack: (stroking her head on Rainbow’s) That’s what Ah call a perfect fancy gala.
Rainbow Dash: I agree. It was a relief to see Dissy comin’ without that funny green jelly blob or whatever. He looked nice in that dress he was wearing, too.
Applejack: Of course, the best part was when he and Flutters danced… It was so romantic!
Rainbow Dash: (sticks out tongue pretending to be disgusted) You know I hate that sort of thing.
Applejack: (raises eyebrows) But Ah also know that deep down y’re burning of jealousy because ya haven’t had the chance to do that, too…
Rainbow Dash: (blushing) Ah! Please, AJ. Changing the topic… What about sitting on that small hill? I’m tired after all that chatting and laughing.
Applejack: (lying down) If you say so.
Rainbow Dash: (takes a deep breath) Listen, I’m not good at this sort of thing, so just stay silent and don’t make things worse.
Applejack: (lowers her ears, a bit offended and concerned at the same time)
Rainbow Dash: Applejack, you’re the most beautiful and magical thing that’s ever happened to me. Some time ago, I couldn’t understand why I felt so alone if your attention wasn’t addressed to me. Why I missed your laughter, sweet as sugar; or why I felt like drowning when I lost myself in those emerald green eyes. I really didn’t comprehend it. But… But now I do. Now I’m sure of the reason why I enjoy so much resting in that straw yellow mane of yours and why I always try to catch your gaze. I love you. I’m sure you had understood this before, but now… Now I feel like there something new in what I’m feeling. A beautiful news I want to discover and enjoy… together with you. (smiles)
Applejack: I… I don’t know what to say… Dash, this… what you’ve told be is beautiful… (chuckling a little) Y’know, it almost sounds like y’re gonna propose…
Rainbow Dash: Applejack… (sits up)
Applejack: Oh Celestia…
Rainbow Dash: (shows a small beige box with her wing, smiling)
Applejack: This can’t be…
Rainbow Dash: (stands up and bows gently)
Applejack: R-Rainbow Dash…
Rainbow Dash: Will you marry me?

There, just a cute lil’ thing I though I’d do before finishing the latest headcanon I’ve drawn (and not uploaded yet, of course). I imagine AJ bursting into tears right after Dash speaks, then throwing her arms at her neck, then kissing her and whispering a babbled “yes”. Oh God, I fear my imagination is going too far ç_ç Oh well. There’s never enough AppleDash in this world, so let’s all just contribute x3 I hope you like it <3