After a incident involving a lightning strike and a bag of fruit pastels, Adrian found himself in a world of human-esque horses, ponies as they call themselves.
As the first of his kind to ever be in this world he is of course brought to their capital, Canterlot, where upon request from the royal family he is to be integrated into society, and not experimented on with sharp and pointy things being inserted into his bum.
Always a plus for Adrian.
But as months went by quickly, Adrian found himself spending a lot more time with one of the co-rulers of the country, the ancient princess making it no secret that she enjoyed his company, describing their conversations as 'a breath of fresh air' and a 'change from the usual formalities she had to endure'
And he wasn't shy to admit that he liked talking to Celestia, she was a good friend to have.
Though somewhere in Adrian's gut he felt a need for a more... intimate relationship with the ancient alicorn.
And a sideways comment from a certain pink alicorn told him that he wasn't the only one of the two thinking about it...