I agree with >>33540521
here and I think there's more steps to it. Like when you pass each other's room you stand for a moment to listed to their breath behind close doors. Or when one of you needs something just before going to bed and go see them, and they're already in their PJs already in bed and it's cute and suits them well, be it a cute little attire for a mare or an unfamiliar outfit for a man, it looks so warm and comfy that later both of you imagine what if would feel like to lie right next to one another. You also whisper instead of talking since it's late at night, and it makes the conversation even more intimate.
And only after an embarrassing talk with Cadence, who came to check your progress, you'll get to stay in one room. After all, it's Cadence's words you're following, you both joke blushing fiercely, both knowing full well that this is what you wanted since the beginning and only now got "the permission" (of course Cadence knew all along). Only then you proceed to sleeping in the same bed fully clothed.