Crowley has always thought his hair was getting long and annoying so you being his lover he asked you to just help him put his hair up, but that ended up in you wanting to play with his hair, which is how he got here.

Crowley's head was face down in your lap while you braided his hair, Crowley was probably like ten seconds away from falling asleep.

Crowley hummed as he stuck the tip of his forked tongue out in contentment as he nuzzled his face deeper into your lap, enjoying the feeling of you playing with his hair.