(My interpretation of "Lyra and Bon Bon and The Mares from SMILE")

After her cover is blown, Agent Sweetie Drops must return to the agency she once worked for known as S.M.I.L.E. Due to this, and her not wanting to leave Lyra, she decides to recruit Lyra for an old project that was abandoned a month before the first bugbear incident.

Now the two are flung into a world filled with danger and lies, doing things against their own nature that are for the good of Equestria.