Given how Sceleritas Fel prompts Durge to kill their lover in the game, most posts and fics I've read feature him being against Durge getting involved with Gortash, romantic or otherwise, because they need to focus on their mission. Totally makes sense, probably what happened given what we see in game.

But. What about wingman Sceleritas Fel? Just for the hilarity of it all. Maybe he deems the Chosen of Bane worthy enough of his master's attention, maybe he just views the whole thing as a chance to further enhance Bhaal's power. In any case he's determined to help his master bang Gortash, cue murderous socially stunted Durge taking romantic advice from their psycho, even more socially maladjusted butler in order to seduce Gortash.

"You should shower in some blood before meeting with Lord Gortash, dear master, it does wonders for your skin and brings out your eyes"

"Why, yes, I do think Bane's chosen will appreciate your thoughtful gift, my dark master. Nothing quite says romance like a dozen bloody hearts in a box"

"I'm sure Lord Gortash enjoyed your date together, oh vile master, who doesn't love a bit of ritualistic slaughter? Why, the way you disemboweled your last victim was simply sublime! If that didn't prompt him to make a move it may just be he's a bit of a prude..."