The fingertips are the part of the body most sensitiveTrusted Source to touch, and your palms aren’t far behind.
Place your hand under theirs with your palm facing up, and tickle their palm with your index finger.
If you want to up the intimacy, maintain eye contact while you do it.
You can kick it up a billion notches by taking each of their fingers into your mouth, one by one, and sucking lightly.