My very similar story Teddy02. After being dry for over a year at age 7 I was invited to a friend's house for my first sleepover. My previous years from age 4 - 6 and bw never crossed my mind as I thought at age 8 I was over it. WRONG! That Saturday night I woke up in the guest bed with a large pee circle that stretched from my thighs to my lower chest and pjs and underwear quite soaked. I quietly got out of bed and changed into my jeans and tee shirt and slept against the wall with about an 8 - 10" space width all night. The next morning their family had gone to church and I was just with my friend's mom. As she packed up my overnight bag she must have noted my wet items I stuffed in there and I blurted something about being sorry I wet the bed. She nicely said something about accidents happen, but I then made the off-hand remark that I had plastic underpants I could have worn but my mom put them away somewhere a year ago (that's right, blame mom! - yeesh). My friend's mom made a very quick statement that next time I slept over I could wear one of my friend's pp that were in a box in the attic.
I do not know which surprised me more: the idea I would be allowed to sleepover again after wetting their bed, or me actually having to wear my friend's pp that he no longer needed, but I did! Even more surprising was my parents never discussed this incident with me and I could not believe my friend's mom did not mention this to them.
Several months later my mom told me I was sleeping over their house again because they were gong out of town with my dad's job. That Friday night my friend's mom did slip on me some light blue pp over my training underwear and I made some weak excuse about not having an accident since the last time I slept over so maybe I did not have to wear it. She thought it best I do. We were both wrong, that Friday night I wet heavily to the point of leaking out the top and leg openings of my pp. I was distraught the next morning since this was the only protection I have ever known and now at age 8 I was beyond these undergarments helping me 100%.
I wrote in more details about this in a previous post some time ago but that Saturday night I had to wear a full diaper and large pp and though vey humiliated I slept well and with a soaked diaper the next morning, I was actually relieved I did not not leak and had a dry bed and pjs. My friend never said anything about it nor his siblings to me thankfully, but some of them must have known. Some comforting words from my friend's mother instilled into me right there of using protection at night for the over all good and this helped me out when I went to college and needed to make the same decision again due to bw and wearing adult diapers and pp.
Needless to say I did not have any sleepovers from age 8 - 12. Too bad you and I did not live on the same street Teddy02, we could have easily noted each other's enuresis and said "so what?, no big deal" and had a great sleepover.