Ulidia were 1-0 down after five minutes when Shorts scored a free header from their first free-kick.
A rare midweek outing under the lights at Loughside saw Aquinas edge out neighbours Ulidia on a perfect evening for football.
This South Belfast Youth League clash at Cherryvale on Saturday morning ended in a tight draw.
Rosario maintained their lead at the top of the table with a resounding win over a spirited Ulidia outfit at Cherryvale.
A swirling wind meant conditions were never going to be ideal for this encounter and it would be a case of who could best take advantage of the elements.