In a romantic context, this usually refers to "playing footsie" or subtle physical contact under a table. It is a classic trope used to build sexual tension in a public or semi-public setting where the characters must remain composed while secretly interacting.
Detailed descriptions of the characters' physical sensations and emotional reactions to minor gestures. leg sex tease
A heavy emphasis on what is unsaid or under the surface . In a romantic context, this usually refers to