My concern is for Tatsuki (the husband) and his lack of sex with Hana. I cannot remember the last time he's had any form of sex with Hana. I was hoping she would ask him to sit next to her in the stream while she was jerking off Yuta and jerk off Tatsuki. Instead, he just gets to watch and jerk off. Then Hana goes to Yuta's tent that night to get fucked and Tatsuki again only gets to watch, with no offer from Hana, either before going to Yuta's tent or after, to be intimate. Finally, Hana tells Tatsuki that he gets to watch Yuta and her fuck, but with no touching, and no sense that Tatsuki will be getting anything other than jerking himself off.
IMO Tatsuki should at least be getting a handy from Hana every now and then instead of having to satisfy himself as he's being continuosly teased.