Wow, that is pretty advanced to zero in straight away to a father relationship thing. Celebrate that, in a mini way. It's no big deal, but seems very hard for most people.
The answer in all things, and this is no different in your specific case, is to lose the 'individual'. That means, let go of anything that used to make you feel like a separate person.
That's hard to describe to most people but somehow I think you'll work it out.
How it manifests is that when you are sitting with your partner you are more in tune with him. Actually, you're more in tune with the totality. Instead of expecting him to be more in tune with you. Magic happens. Maybe sexually, but in other ways too. You truly become one, and purely from your own presence. Cause otherwise, you would have expected more from him. And been trapped by that expectation. Which is a mind thing.
This way you truly take care of the situation in presence. Joy is the result, for both of you.
Who would have thought that one person's presence results in two people's joy. That's the miracle of the universe.