Larger seems ill advised. Frankly anything that wasn’t meant to be used in that way seems ill advised since the cord may not have the proper strain relief and be intended to be used to remove the toy from an orifice.

But going larger definitely feels like it creates more risk of putting too much strain on that cord, breaking the connection at one end, and leaving the toy stuck

Thats my two cents, but I’ve not used that particular type of toy so hopefully someone with more knowledge can chime in.

and the bottom was inside the tub

I’m sure many a bottom would enjoy an openable shower curtain. Maybe not as much as tops would, but still, it’s a cute idea

In the kink community in my area it’s a common joke that the ven diagram of people who play D&D and people who are kinky is just a circle.

Its not actually true, but it does feel like it is lol. If you need a thing to talk about, bringing up D&D almost always gets people engaged in conversation