It's netorase but it also teases a little bit netorare, in this whole doujin Rina and George do use condoms.
However there was a window neither readers or husband who fell asleep know what happened in between when George left. We do see her still with a condom stuck inside her vajajay when he went to check at the bedroom and then we get a time skip with her pregnant and him asking her if she still kept doing it with George afterwards to which she replies that once again she only did that with him that day and that's just MC being insecure and dealing with his fetish cravings well it makes no sense for her to lie because when the baby is born there will be some clear differences lol. Interesting NTS doujin.
I think it teases ntr but we clearly see a condom in her vagina afterwards so I think it will be her husband's kid. Glad to see a doujin where husband was actively there in the cucking! Great nts, thanks for the share