So just what is it you might ask yourself.. Well, a oneshot is basically a short story made on a requested couple..
Won't be my best but here's an example
Ex
Swallowstar sat down by the fresh kill pile. Feeling a soft bump she turned and saw Brackennose and her heart started fluttering. Brackennose looked at her his green eyes meeting her blue. Swallowstar looked away blushing crazily. Brackennose looked away too

Ok that is just a really short, really poopey example