A one-shot clopfic featuring Captain Buggy from One Piece. He had mysteriously arrived in Ponyville one day, not long after the threat of changeling queen 'Chysalis' had been dealt with. He spent several years living in Ponyville, forming friendships amongst other types of relationships amongst the locals. Somewhere along the line, he managed to form a harem based relationship with the Elements of Harmony.

<Human x Pony>

I'm not sure I would call this romance. Even though there is clearly a romantic bond between the characters, there are no romantic gestures within the writing. Oh well, I'll just put it in there anyway.