Guy from city goes out to the boonies and falls for his neighbor. They do the deed and the neighbor is the uke and uke says “I’m not a girl”. The seme misunderstands him and runs away. They get together at the end ofc.
That sounds like chapter 5-6 of this https://www.mangago.me/read-manga/hitori_to_hitori_no_3650nichi/
Ain’t no way I’m letting my own kid sacrifice himself like that. Are you kidding?? Bich, we are LEAVING. We are RUNNING AWAY. There are plenty of boys in the pond or however the saying goes!!