Nog wants to join Starfleet and Kira is being eaten by crystal (or is she???). The DS9 Rewatch has a "Heart of Stone."
Nog informs Sisko that he’s had his bar mitzvah—er, that is, his Ferengi Attainment Ceremony, which means he’s now an adult, and he must become an apprentice. He chooses Sisko as the person to whom he wishes to become apprenticed—he wants to join Starfleet. Sisko points out that handing him a bribe (a bag full of latinum) won’t cut it. He has to apply to Starfleet Academy, get in, and graduate, and before he can do any of that, he—as a non-Federation citizen—has to get a letter of reference from a command-level officer. Like, say, Sisko, who says he’ll think about it. (Sisko tries to give the bribe back, but Nog insists on him keeping it.)