I simply picture that scene starting with Nika, Vanessa, a blindfold, handcuffs, and a strap-on.
A blindfolded Nika grits his teeth and bears it, for the shake of his plot with Bella.
After what feels like an age, Nika's blindfold partially slips while he's on all fours and he catches a glimpse behind him. To his horror, Nika sees the heterochromia eyes of William while a smug Vanessa looks on from the corner of the room, strap-on in hand.
This is my way of sayin' I don't think I'll ever play a Vanessa route that requires any form of submission because I suspect that, deep down, Vanessa can only hate-fuck the opposite sex.