[Andrew 25:17]

Fix your plug on a chair using a rope, then sit over it, put nipple clamps on and tie them (if they have a chain in between tie the chain otherwise tie the single clamps) down on chair legs or at someting heavy on the floor, in a way that your nipples will get very stretched if you stand up.
Now move your hips up and down slowly to fuck your ass with the plug for 1 hour (you can use your vibe during that if you want) if your ass need a break you can just stand up and get your nipples stretched until you are ready to go back to fuck your plug.

If one hour is too easy you can do more, or repeat this more times, up to you.