My wife (29F) and I (30M) had just finished our Valentine's date and we were a bit tipsy. We come home to have a few more drinks and end up getting quite drunk. Things start to get a bit hot and heavy so we move into the bedroom where we proceeded to have sex. My wife gets extra horny when she is drunk so she asked me to get her buttplug and put it in her. I scrambled to her suitcase of sex toys and find her plug and put it in. We continue to have sex in her vagina and after a while I noticed the buttplug was missing. This is my wife's worst fear as we live in a small town and going to the ER to get something removed from your ass would spread around to everyone very quickly. I don't know how to let her know gently so I just tell her straight. The buttplugs gone.
She starts freaking out and I calm her down as best I can and let her know that I can get it out (even though I don't like my chances). I put my fingers in her to try find it and I'm digging around for a while and can't feel anything. I start to freak out now because this thing must be a lot deeper than we realise. After a bit more of an inspection I think I feel it but something different, it doesn't feel right. I keep pressing on it thinking it's something else and in my drunken state I realise what's going on. I am touching the buttplug from inside her ass but the buttplug is actually in her vagina. I put the butplug in the wrong hole and neither of us realised because we were too drunk. I washed my hands and then went into the correct hole and retrieved the buttplug. Needless to say the mood was ruined but we were both relieved and had a good chuckle afterwards.
TLDR: Lost a buttplug inside my wife only to realise I accidentally put it in her vagina and not her butt.
Edit: We had PIV sex after I put the plug in.