crowley had always been different then many of the demons yes he was evil... and cruel and overall a real asshole at times but in a way he was broken he still cared to some degree he still felt pain especially from his past.

so when he was like this curled up in bed with you it brought back the part in his mind that deeply craved love and affectionate in a way that was deeper then just sexual. He craved real emotional intimacy and comfort he craved love. As much as he hated it you giving him any amount of it well... it started to break down his walls

so as you two lay in bed you hear a soft whimper come from him. "Mphf-" he buried his face against your chest. In shame? Embarrassment maybe.... as tears started to stream down his face

the memories of his mother leaving him the way she never loved him the way no one had ever seemed to love him all the pain he's been threw and all the suffering he's caused continuously playing in his mind hitting him like a brick.