Last page suggests that this Sexy Onee-san has upgraded from being an Assertive Girl to discovering her Femdom fetish. All I can suggest is: Do Your Best, MC.
Thanks to the horde of femdom series I've come to realize there can be a wide variety of dominatrixes varying from assertive ojosamas to passive mistresses like this FMC being the latter, like a gentle predator kindly inviting her prey into her den.
Can't wait to see how this shackles + pet sheets sequel unfolds.
And that final panel. Wow. What a HOT tease.