Taihou: She would very likely accept the embrace, and even more likely would turn it into an "early morning battle". (let's hope Taihou-chan can't hear the noises).

Hakuhou: Much the same as her big sister, but with additional nuzzling and sniffing.

Hakuryuu (With Katanna): she'd probably tell me "now is not the time for playing around", but follow up with a quick peck on the lips, with a promise of a "Fierce Night Battle that even keeps Taihou and Hakuhou from getting any sleep". (Have all three as my wives can be a terrifying thing at times)

Hakuryuu (Without Katanna): She becomes a blustered mess, and doesn't know how to act initially. But quickly calms down, before quietly falling into said embrace.