NAME_1's fiance NAME_2 always pressured NAME_3 to swallow his cum, which she always denied. On their vacation NAME_3 decides to indulge NAME_2, just not the way he expects it. It wouldn't be NAME_2's cum that she swallows. When NAME_2 comes out of the shower in their hotel room he sees NAME_3 in just a sheer black babydoll with nothing underneath, kneeling before an armchair. There is a knock at the door and NAME_3 nods to NAME_2 to let the guest in. She had arranged for the cute room service NAME_4 to visit them so NAME_3 can have her revenge.
You can instantly see the confusion in NAME_2's eyes as he is directed to a corner into a spectator position while NAME_5 plops down into the armchair in front of kneeling NAME_3, grinning.
'I will be swallowing cum, alright...', NAME_3 says spitefully."
Flesh out the story from NAME_2's perspective, make it extra smutty and hot, at least ten paragraphs. Focus on NAME_3's skillful mouth and the act of swallowing NAME_5's cum for NAME_2's eyes.