Keep from Climbing Too Fast (male)

Hi everyone, I usually wrap up my sessions by stroking my penis on the bed, driven by my thoughts. This causes me to finish much sooner than I’d like. How can I position myself so that rubbing doesn’t lead directly to ejaculation? I have a couple of feet of rope, some office supplies, and a bullet arriving in about a week. Side Note: During self-bondage sessions, there’s also the issue of getting bored and unlocking myself. I’ve even done overnight spreadeagle just to let boredom ruin it. Any thoughts on how to fix that?