At first, I didn't really understand why most guys fucking Kasumi in Iizuki Tasuku's work don't cum inside her. It's a rape, so the guys won't really give a shit whether she likes it or not. But later, as I found out by reading the dialogues from Ira-ira yokubou 2, i discovered that she isn't actually getting raped. She was getting gang banged voluntarily, so i guess that's why the guys aren't cumming inside her. She is just a whore, that's why she's agreeing to getting fucked by multiple random men she hasn't met before. Like here, the dick between her breasts cummed all over her breasts, face, hair and arm while the dick up her ass cummed all over her ass, legs, crotch, and back, but she wouldn't mind.