Toast I totally agree, diapers are great for the "security" factor, both when venturing out or during a long session at home. I love being able to slow ride my toys on the couch without having to worry, and when going out it gives you the freedom to load your ass with lube beforehand. I find it really hot when I'm leaking lube around my plug in public, makes me feel well used and ready for more 😃.
The combination of butt plugs and diapers is a part of most of my fantasies, and something I practice a fair amount. I'm happy (and horny lol) to share some things I've learned through my experience:
1. If I put a diaper on as tight as is comfortable, it will give my toy 2"-3" of slack to slide out of me before it hits the hard stop. Its perfect for riding a dildo, and it makes it easy to have a long, slow, intermittent thrusting session (my favourite). I've had many awesome nights on the couch with my BF watching TV while he slowly works my toy with his foot through my diaper. If the toy is flexible and has a small base it can sometimes bend and sneak its way out, but if the base is large (like a dildo with some nice balls) it stays in line.
2. To my surprise, I've found it's more comfortable to keep larger toys in if they held in to the max and lightly pushed by my diaper. I've found a couple ways to take out the 2"-3" of slack for when I want that. One way is to put on more layers of diapers, the slack reduces with each layer and at five diapers deep the slack is pretty well gone, plus you get some enjoyable bulk. The other is to wear a butt plug harness over the diaper, the diaper adds padding to the straps which is nice. I figured out a way to make a very comfortable and effective harness from two neck ties, I wish it was simpler to explain.
3. If you enjoy sleeping with a plug as I do, the diaper is a great addition. You can give yourself a thorough lubing without having to worry about the sheets. Also takes the worry out if you want to give the plug the odd push with your bum to make it adjust it to a more comfy position.
4. I enjoy enema play, but my BF not so much. I get it, I more enjoy the physical feelings and the fantasies, witnessing the evacuations is sometimes gross even for me despite my familiarity with them. With diapers he can administer an enema to me through an enema plug inside my diaper with its inlet hose poking out the top. It gives us the freedom to do enema play outside of the shower, and neatly contains the sometimes gnarly results.
5. Several layers of diaper can create a neat bondage situation. I was wearing one of my largest toys one night (my eyes *may have been a little larger than my asshole) and had put a silly amount of diapers on top (~10). I got to a point where I was feeling overwhelmed, and wanted it out. Had I been nude, it would have been out in a second, but I had to undo 40 tapes before I was free. The desperation of wanting the toy out made it pretty well impossible to work the tapes, so I had to force myself to relax and overcome the feeling a bit before going through the 3 minute process of getting them all off. I hadn't considered the situation I created for myself until it happened, so there was a touch of real panic and helplessness when I realized I'd have to ride out the waves of intensity in my ass. Thinking about it afterward I realized even a few layers of diaper combined with bondage mittens would make a decently escape proof butt plug harness, even if you can find a way to fiddle with the tapes there is so many to get through. Being unable to free myself despite it being such a simple fastener within my reach made a unique feeling for me. Can't say I enjoyed it much in the moment, but it turns me on when I remember it.