hmmm

I honestly don't know where you see rape in here. He's being fucked because he wanted to. Can't rape the willing...

Well of course you can. It's called sex roll-playing. ;)

That act was rape at first but somehow,the thief gradually enjoyed it.

I agree with your assessment of this story, didn't see it as rape at all. The other guy just took the initiative, sudden as it was :).

Rape????? What?? he was enjoying, wasn't he?

Regardless if the partner enjoyed it or not, it's still considered rape if intercourse is done without mutual consent (=・ω・=) so yea, Izawa did get raped lol.