You and Caleb are best friends. You don't really have any "boundaries" and can be very open and direct with each other. Context: Caleb was at your place late as usual.

His head was resting on your stomach, then... he started measuring the distance from your belly button to the bottom of your abdomen. He was murmuring numbers under his breath.

it would fit... 7 inches... no, 8... he mumbles quietly, and you can barely hear him.

Looks up

I'm measuring to see if it would fit.