Five short lines, and a scene you can picture at once: two friends standing at a gate, looking out over a field. The speaker doesn't tell us what they talk about or even whether they speak at all. What matters is that they are together, and that the speaker is proud of it, or at least comforted by it.
The phrase "two best friends" appears twice, almost like a small refrain. That repetition makes the friendship feel like something the speaker keeps turning over, a fact worth saying again. Then the last line turns the friends into "silhouettes," dark outlines with no faces or details. Silhouettes suggest low light, perhaps dusk or dawn, though the poem never says which. They also blur the two people into a single shape, as if the friendship matters more than who each person is.
The mood is quiet, calm and a little wistful. Nothing happens, and that stillness is the point: it feels like a moment the speaker wants to hold onto.