Wahhh!! Thank you for asking, I've been thinking about them a lot recently!! This'll be with Femguru cause I'm a simp for her. 🥺
1. Suguru would be really into gardening I think, just cause she's very nurturing and likes the feeling she gets when her plants are doing well. Toji doesn't get it but he'll always water things for her when she asks him to, helps her weed her garden beds, gets all the pretty flowers he sees at the store that make him think of her, etc. Acts of service!! Then of course he likes the $$$ they save from growing their own produce, and Suguru gets the kids involved with her.
2. Toji's got great hands for giving massages, but he'll make her beg a little before he'll actually give her one. But she figures out eventually that just complaining a lot about back or foot pain is enough to make him give in and give her one, though he'll gripe about it.
3. Suguru likes it a lot when Toji picks her up!! One, because it's just really hot for him to put his muscles to use (and put her hands all over him while he does it), and two, because it makes her feel very feminine and protected. I think male Suguru would like it too though.
4. They're both morning people. Both of them like getting up to have tea in the morning, to sit in the quiet before their neighbors start waking up and making noise, and going outside before it gets too hot to go out.
5. I don't think either of them would manage heat very well, so summertime is a lot of sitting in doors with all the curtains closed and the fans blasting. They'd eat lots of popsicles and cold foods, and spend a lot of time lounging in bed doing nothing cause it's too hot out to do anything else. The kids climb into bed with them and lay on top of them and it makes them even hotter, but while Toji wants to kick them out, Suguru insists on letting them stay, and what the wife says goes.
6. Every birthday and gift-giving holiday they don't get each other much, just books that they think each other would like! Or sometimes useful, thoughtful things, like gardening tools or new pans or dish sets, or Suguru would use cult funds to get Toji new cursed tools and guns. That sort of thing.
7. Speaking of, this is a little more self-indulgent, but I really like the idea of Toji teaching Suguru how to shoot. Suguru's back to his chest, his hands around hers, spending hours together at the shooting range. I love Suguru's finger-gun cursed spirit in the anime and I just want more of that, hehe.