"Why do I have a penis? The only reason in this is only to server Yuyuko-sama."
With this in mind Youmu fapped all the day as training her ochinchin. It was taken away by Yukari one day after her fapping routine (by Yuyuko's order) for neglecting her duties.
And then two men came and raped Youmu (female).
Despite being raped, all Youmuu had in mind was about her ochinchin. Yukari showed pity and return it to Youmu.
Seeing Youmu turned into a futa, two rapists,
"OMG this is RARE!" and they banged Youmu (futa) for Round 2.