Remember when Naruto came back from his trip with Jiraiya, talked to Sakura, and then Konohamaru barged in? Well, in that scene, Konohamaru used: Oiroke: Otoko no ko doushi no Jutsu (Sexy: Boy on Boy Jutsu) aka Yaoi no Jutsu
And, Sakura nosebleeded, revealed she's a closet Yaoi fangirl
Sarada probably got that trait