Or alternatively the 'gangbang' occurs before the exams start; a group of genin corners Shiori while she is alone absording chakra from training yard. Then said genin then proceed rape her and without knowing their chakras get depleted (and she discovers chakra potency of man's cum in feeding her craving hunger). The men grow rapidly weaker and she then finds perhaps that her curse can be gift at times.<br/><br/>Then, this point Shiori and Yoshi first time meet as Yoshi then charges in to interfere on ongoing gangbang (he can see Shiori tied up and have signs of abuse on her) and the genin attempt counter the intrusion....they discover they have no chakra whatsoever (when they attempt mold it their surprised how low reserves they are) and so Yoshi has fairly easy fight against several genin who were signed up to attend in chuunin exam.<br/><br/>Then after whatever drama follows from the fight (as without doubt Yoshi goes flashy with fire jutsu and chakra used in fight raises alarm to local ANBU forces come investigate the matter), then Shiori and Yoshi part ways after that but Shiori and Yoshi formed a sort bond/chemistry going (and go with classic 'rescued maiden falls for her rescuer' syndrome). But then they meet again as second part of exam; survival is initiated with team roster random pick ups and they wound up to same team. Then during survival exam she has no time nor means absord harmlesly from surroundings the chakra (she gets depleted from several battles) and then is forced to reveal her condittion or else she would die....and tell most effective way to recharge quickly is through sex with a male.<br/><br/>Then if third party member is female then it falls to Yoshi to play the role as 'chakra battery' for Shiori for remaining duration of the second exam (and first time triggers and awakens his sharingan). But somepoint Shiori and Yoshi break up (as Vex suggested that Shiori pushes Yoshi away, even if she likes him but because it's best for Yoshi be involved other women than her to preserve dying Uchiha clan).