Just something with Steve and Jonathan being Nancy's dirty little sluts. Maybe she makes them use a double ended dildo so she can watch, or they both take turns going down on her and licking her cum off of each other's faces, or whatever other manner of filthy things you can come up with.

I'd also like if they both called Nancy Mommy, but it's not that important (I could also get down with them calling her Daddy too).

Another idea that the filler can choose whether they want to include it or not: one of the boys being more dominant over the other and taking it upon himself to teach him how to be a perfect fucktoy for their gf, verbally encouraging him and maybe manhandling him a little in the process.