You've built the answer to your question into its premise: "a woman changes his mind", you said. So sure: she changed his mind, and thus the sex was consensual. No rape involved, and I don't think I've ever met anyone who would say otherwise.
But some people seeing what you wrote might be imagining a more general situation. Rather than "a woman changes his mind and they have sex", they're instead picturing "a woman gets him to have sex anyway". And that has a lot more room for ambiguity. Maybe she did something to really turn him on and they wound up eagerly jumping each other (not rape). Maybe they had a heart to heart talk and he decided that even though he wasn't eager, this would be really special to her and he went with it (not rape). Maybe he kept trying to leave but she blocked the door and was physically threatening and he concluded the only way he could get away without injury was to let her take what she wanted (that's rape). Maybe she kept giving him alcohol until he wasn't able to process what was going on and got sexual once he was to that point (that's rape; given his initial refusal I'm definitely inclined to call it deliberate even if she was drinking too: this is a well-established serial rapist technique). Maybe she kept gradually pushing his boundaries and wearing him down, ignoring his clear lack of any positive reaction to what she was doing, and eventually escalated things to sex (borderline: I'd need more info to judge if it's rape, but she's definitely an asshole).