Wow @namechangedyorkshire - some great suggestions there.
I would say it takes two to do this so it's worth trying to have a chat about it beforehand. There's a popular quiz online called Mojo Upgrade which is worth searching for. That could be a starting point for discussion?
You mentioned you both like foreplay? If time is an issue and the sex is scheduled maybe play on more of a build up beforehand? Maybe some sexts or teasing pics on the day before or day of? I second dirty talk, not for everyone - can be embarrassing but also very hot if the moment is right.
Toys could also be something new to try. Maybe a Magic Wand for you or a Fleshlight for him?
Lingerie can be fun. Is there something he'd love to see you wear? Could be basques, stockings and heels? Could be leather or rubber?
Mutual masturbation is amazing, as is the one-sided submission play that was mentioned above. Where one of you submits to be given pleasure by the other?
Some quality porn can be good to watch. Can aid with foreplay or setting the scene. It's not all fake American stuff with plastic women, there are some good more female oriented stuff out there.
If you've got three kids, then car sex is probably out of the question. Can be risking and thrilling though. Likewise for office sex. Highly risky but then can be incredible and memorable.
You've only one life to live so may as well have a good think about what turns each of you on and then explore crossing a few things off those lists. Best of luck to you both!