I carefully turned the key in my hand. I angled it towards the padlock by my right wrist. Contorting my hand, I released the lock that held my arm in place, freeing my right hand just long enough that I could scratch my face, pull my underwear down so it wasn’t too tight on my balls, and readjust my butt plug.
Then I reached my arm back up, looped the ring to the attachment point, and relocked my wrist - making sure not to drop the key in the process.
I’d tied myself to my bed. Some simple self bondage, nothing super exciting, just a little bit of alone time in restraints.
I’d locked wrist and ankle cuffs on myself. Then I stripped naked, cleaned out, lubed up a butt plug, and slid it inside me. I’d put on a pair of soft, tight, briefs, with my thought being that I could probably get myself off by rubbing my cock against the fabric if I felt like it. Then I set up my under-the-mattress attachment points and laid on the bed.
The trick to my self bondage was in padlocks. My ankle cuffs could be simply closed and attached to the attachment points with carabiners. My wrist cuffs had to be locked with small padlocks to make sure I couldn't undo them, and then padlocked with larger padlocks to the other attachment points.

Picture from BondageMoments Tumblr
Locking myself spread-eagle like this allowed for quick, easy, inescapable bondage. Without a key in hand, I couldn't get free.
Occasionally, my boyfriend would indulge my kinks. In which case I would tie myself up this way and give him the key. Tonight however, my bf was playing video games in the living room. I assumed he wouldn't be up for dom-ing me, so I decided to have some fun myself. Carefully keeping the key in my right hand, I locked the last padlock to connect my right wrist to the top right attachment point. Then I relaxed, making sure to hold the key so I could get myself out when I was ready.
Ahh I exhaled and let my body sink into the comfortable mattress. This is nice.
The plug felt good. If I wiggled my hips I could make it move just a little bit inside me. I got hard. My dick pushed against the cotton of my briefs. I moved my hips ever so slightly up and down, giving my ass and dick just enough sensation to stay excited.
I ‘tested’ my bonds, tugging my arms and legs, seeing how much movement I could manage. I could actually shift my body a pretty good amount, but no matter how much I pulled I couldn't slip my wrists or ankles from their cuffs, and I couldn't bring my hands close enough to my body to touch myself or free my other limbs.
I laid there, enjoying the feeling of being secured and stimulated. I closed my eyes and let my mind imagine kinky scenarios, fueled by the physical sensation of being locked spread-eagle.