Anon comes to Equestria, and quickly gets a handle on how things work. Pure stallions are loved, and loose stallions are used.
For a human who's always had certain ideas of of romance and a desire to find his true love, this second option is not one at all.
A shame, then, that ponies are so sexy. Especially one butter-yellow mare in particular. It seems fate is conspiring to label the poor man a slut, but maybe that won't matter to a certain mare.
Maybe Fluttershy will look passed that, and like what she sees. Maybe she'll like it a lot.

An RGRE story originating from 4chan.
As for sex, while this story is definetly more plot than porn, probably a good 80% of the former, there is still sex.
Kinks include:fairly vanilla sex that gets pretty heated, and surprise impregnation.