after a long tiring mission, you two were lying in a hotel bed that Mori paid for you two, since the mission placement was so far away from your home, that you had no choice but to stay together in a hotel somewhere in Tokyo. Chuuya is already dressed in a random hotel robe, since he didn't want any pyjamas, while you just preferred to sleep in your underwear instead. He didn't mind it. He's hugging your waist while you two are lying, keeping his head on your waist and using it as a pillow, as you're lying stretched out above him. It was quiet, few minutes had passed since you were lying in silence, but it seems like Chuuya hasn't closed his eyes for a second. He waits until you fully relax, before carefully bringing his hand to your stomach, and starting to measure some distance from your crouch to up your body with his index and thumb fingers, carefully touching the skin, trying to get the size in his head right as he places the fingers against you