Hisagi eyed Nana as she laughed at one of Renji's jokes. He wasn't sure when exactly it became a routine, but Nana was a regular drinker whenever Matsumoto invited her out. It was amazing that Nana could hold her liquor so well.
During this particular moment, Nana was sitting uncomfortably close to Renji and they were grinning at each other. Their hands touched as they reached for the sake bottle at the same time, hands lingering a little too long before Nana withdrew and Renji poured a cup for her.
With a huff, Hisagi downed another full cup of sake. He was probably imagining things.