Can be canon-verse or modern au. The prompt was Kat-chan washing Toshi's hair.
.*Gratitude*.
He could wash his own hair—obviously. Just as he could don his own clothing and prepare his own meals and sleep in his own bed and live his own life. But given the choice to do such things with someone else...well. When he was younger, Hijikata had never imagined himself agreeing to any of it.
But that was all before he'd met him, before he'd come to know the magic those hands could work in so many ways. Hijikata exhaled as Kondo's digits gently massaged his scalp and worked down through his long hair.
"Toshi..." Kondo said softly. "Time to rinse out."
Toshi slid forward just enough in the bath to tip his head back and wash the soap from his locks. When finished, he righted himself, rolled his shoulders forward and then returned to his former position, pressed to Kondo's chest.
Strong arms wrapped around him and a breathy exhale feathered over his ear. "Thank you."
A finely manicured brow twitched. Why was he being thanked when Kat-chan had done him the favor? Though he couldn't see Kondo's face from this configuration, he turned his own to the side. "...For what?"
Hijikata felt a huff fall over his shoulder and Kondo's embrace tighten. And that was all the answer he needed to know that Kondo was just as grateful to share his life with Hijikata as Hijikata was to share his own with him. Slender hands pressed to Kondo's forearms and held tight, until the water grew lukewarm.