Aftercare gets talked about as a kink term, but it describes something every couple needs: the transition back to ordinary life without one person feeling dropped.
Notice what each of you needs
Some people want to be held, some want to talk, some want a shower and ten minutes alone. None of these is wrong, and they are rarely the same in one couple.
Say the small thing
"That was lovely" costs nothing. Silence right afterwards is easy to read as indifference even when it is contentment.
Do not make it a review
Feedback has its place and this is not it. Anything critical said in the first ten minutes will be remembered for months.
Watch the phone
Reaching for a screen straight afterwards is the single most reliable way to make someone feel like an item on a list.