A tiny part of Jester is maybe a little disappointed that 'Hot Boy' Essek joined the Nein to travel with them AFTER she'd gotten together with Fjord... until an offhand comment from Fjord makes her realize he's interested, too. They talk and it's clear his main concern is just practicality (Essek's kind of aloof and liable to be skittish, not to mention he's a slight, frail drow to Jester and Fjord's more adventurer-esque builds, and maybe neither of them know how elf anatomy works, so physical compatibility is a potential worry), but otherwise he's as into the idea as she is.

The two of them (probably mostly Jester) decide clearly the best course of action is to enact an elaborate plan to seduce Essek.

+Whether it's romantic or purely sexual is up to you.
+Methods of seduction can be whatever you'd like! Maybe Jester suggests she and Fjord try playing out a novel she's read and he begrudgingly agrees, maybe they try and encourage Essek to engage in a little voyeurism... who knows?
+Whether Fjorester intends this to be a one time thing or a long term arrangement to be negotiated after the initial seduction is also up to you.
++Emphasizing differing anatomies/cultures is neat. Maybe elf ears are highly sensitive, or any skin to skin contact is lewd for drow culturally; maybe tieflings growl or have no refractory periods or their tails react to their moods... etc! Have fun with this if you want ;)
++Preferably, their seduction succeeds. But if you want to subvert the prompt in some way, be my guest?
-No noncon/dubcon please, though.