For me the downer was that she only wanted "breeding roleplay"
*For now.
As for me, I like that they talked about it as it opens the door for impregnation in the future. But first, Laura needs to get used to the idea, to start liking it. After that both her and MC enjoy several of those roleplays, they'll be able to have another talk, and push this idea even further.
Maybe it'll start with her teasing MC while she's fucking a bull, telling him that she has forgotten to take her pills this month and that she's probably fertile. After getting womb filled with cum, she could then reveal that this was nothing but a little lie to see his reaction. If MC was aroused by her actions, by the idea of her potentially getting pregnant, this idea could stay in her mind for a little bit. And she could then plan to do it for real next time: Not taking her pills, allowing someone else to fill her up and maybe impregnate her.
Well, of course those are just suppositions from me. But nevertheless, the door is now here. We just probably won't see it anytime soon as this might only take place near the end of the story.