"Oh so Omi, you want me to be your date?" Atsumu teased.
"Fake date." Sakusa clarified.
"Right because you don't actually like men."
"I like men just not idiots like you."
Atsumu's eyes widened in surprise. He was shock, so much so, that he almost forgot to be offended by the last part.

Or Sakusa's parents force him to attend a family gathering at which they almost conveniently forget his ualty and try to play match-maker. Only that this time Komori has the 'brilliant' idea, Sakusa bring a date to avoid it.
The risk was calculated and Sakusa was apparently very bad at math.