Maybe just some kissing

If you are lucky enough to have started your physical relationship slowly then maybe the best thing to do is go old school.
You'll both be permanently knackered and any chance you get all you'll want to do it lie on the sofa and watch mindless TV. So try just kissing, explain that this is all it will be and just kiss, hold each other and do nothing else.
It's sensual and lovely and as long as you both know that's all it is going to be then why not just enjoy that.
Once you have done this and fallen asleep in the glow of tingly lips and legs squashed together you'll want to do a little but more.