Um, if you have boxer briefs with an open flap, like even Hanes that come in the 3-5 underwear package from walmart, you can cut two slits on the inner flap (obviously not making them too big), about an inch vertical length apart. What you do is shove the front of your packer through the top slit and then use the second slit you cut to keep the majority of the end-side of the packer from touching your skin. I do have other packing underwear, all of which are different in their own way, but this is the only way I can actually leave my stp in my packer without looking like I have a boner all day. I don't have to take my underwear off and I really haven't had much of a problem with using the medicine spoon style stp unless I'm not paying attention at all and forget to aim. If you insist on using your stp device inside of your packer, then this is the only advice I can give you. That and practice. Keep practicing.
P.S.
You never said whether or not you had an stp harness or not, so I kind of assumed you didn't in the post. I honestly don't know how you are keeping your Mr. Packy in your boxers at this moment, so I gave you a word of my advice. However, somebody taught me how to do this on youtube and it was an ingenious idea I came up with. I just found that it actually works really well, especially if you are using a harder stp. You can also practice without clothes in the shower or something on your spare time if you really feel like you are not neat enough for your liking to feel comfortable peeing with most of your clothes on. If that seems silly to your or you have already done this, then try to head over the bathroom before you actually are finding yourself rushing to get the bathroom. If you give yourself time to aim and figure out the exact position stp and handle your technique that works best, then you'd be all good to go. However, as I said, you must practice this.
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