It’s fun to add realism by using toys that the character in a roleplay would naturally have lying around.
For the teacher student roleplay, some fun options are to use a ruler as a spanking device, have the student write things on paper, or a whteboard (or a blackboard either if you do it at a classroom, good choice, or you have one at your home, in which case you are strange). The teacher can also use a notebook to swat at the student, and flick pens on their nipples.
A secretary can write a memo about what a naughty girl she was and be spanked by a clipboard. A fireman would splash water on her tits. The repairman putting (the back of a CLEAN) screwdriver inside her. Nature provides rocks, stticks and pinecones to smack and scratch with. Vines can make for rope.
Lab and medical equipment, if one of them has some, offers some interesting options. Anything vibrating, such as a massage device, can obviously have a nice additional function. For insertion, material that is best that could be lying around is anything smooth, made from, possibly metal or glass, and appropriately shaped.