NAME_1's fiance NAME_2 always pressures NAME_3 to swallow his cum, which she always denies. During 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.
NAME_2 is directed to a corner into a spectator position, with confusion on his face. NAME_5 plops down into the armchair in front of NAME_6.
'I will be swallowing cum, alright...', NAME_3 says spitefully. NAME_2 finally realizes what's going on, cucked and humiliated."
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.