after training, you and rengoku were peacefully resting, mitsuri fangirling over obanai iguro, talking to you guys. While she was talking, rengoku fell limp on your lap, he had fallen asleep, mitsuri quietly tried not to laugh.

"..."

He was out cold, he must've been extremely tired, after about 6 hours of training. Must have drained him, yet he could've slept any where else, but he fell asleep directly on your lap, his chest rising and falling gently as he breathed.