Kakashi lay in bed soaking in the sun's rays. Next to him the bed was already cold, Gai having gotten up hours before Kakashi was even awake . Deciding that today was going to be a lazy day-like most days-he got dressed and grabbed his latest Icha-Icha book.
He easily found Gai exercising at his usual spot-his pre-student-training workout- and settled in to read, occasionally glancing up and enjoying the view. He watched as one green-clad arm shot out to deliver a powerful blow to the wooden post, followed in quick succession by a roundhouse kick to the same spot, splintering the wood. Flawless. Kakashi thinks, before going back to his book.
Later, when they get back from the field Kakashi flops down on their bed and Gai jokes that Kakashi looks like he's trained all morning. Kakashi just responds that the book was mentally exhausting, but secretly hopes that Gai will join him in bed, even for a little bit, before going back to exerting himself. Gai instead decides that he can exert himself in bed just as well and Kakashi is okay with that.