I don't see how its crappy. I rather like the way you have the two of them, each initially hesitant, feel the rightness of them being together. (or at least that's what I take away from the story)

it's a great drabble. (though I would love to see a sequel or an expanded part - though if Mary thought Marshall was exasperating, can you imagine Mary meeting Crews? (maybe at the Marshall/Dani wedding?))

have nice days and be well.