Hmm, this is weird though, because 1, I'm pretty sure that was Hebishima's model (Same spiky blonde hair), and 2, Fujino had said he wouldn't do anymore "NPCs having sex" scenes for the game. Granted, he broke that 'promise' in this update when he actually made a scene of the gyaru girl sucking Inoda off, but I would have assumed that would only apply to male NPCs at least, so would be weird if he had some random there just for the sake of Alice's plot. So either you are both right and he decided to fully break that 'promise' he made of not making anymore NPC characters have scenes...or he went and made Hebishima part of the prostitution rings/sexual criminals Alice is investigating, which wouldn't really feel too out of character for him funnily enough XD
Actually, can you tell me where Alice says one of her friends is around that you refer to? Seeing that may help me clarify things.