Clearly Rui-chan's not so much exercising "femdom", but rather she's being an Assertive Girl, especially towards a client she likes. Possibly her feelings have escalated up to the point where 'Sign Be Damned'!
And you've got a straightforward invitation to "come back and be naughty, again!" ... better give serious thought to making her way more than just your favorite booking, Sakamoto ... you Lucky Bastard (GRR)!
In conclusion: "Ah, What A Fine Day For APPROVING a Vanilla-laced debut work on FAKKU!"
Page 5. Upper left panel *Huggies* That caught me off guard a little and made me laugh it was cute af. And hell yes we got a good boy being wanted by a legit cute af girl
Cultural Note:
When Japan passed its Anti-Prostitution Law in 1956, prostitution was narrowly
defined as coitus-for-cash, which allowed brothels to stay in business by simply
forbidding intercourse (page 12, panel 7). Anything else goes---handjobs, blow-
jobs, paizuri, and sumata (pussyjobs). https://en.wikipedia.org/wiki/Types_of_prostitution_in_modern_Japan