Once those two Love Rivals heard that Sasuke was given a hard round by the usually shy Hinata, they had to join the fun! Even tho Sasuke was used by Hinata´s thighs to be squezed almost into death, it was nothing compared to the compulsive pressure from two magnificant babes!
The Uchiha stood no chance against neither of them, what hope was there to even endure two at the same time?