He ate my 🍑 and um...

He kept saying hoe he wanted to give me a rimjob after each time we hooked up. I thought about it and decided I wanted to try it out. He started and it was really pleasant. I was enjoying it and he was too. He told me I had a pretty butthole which made me laugh cuz how can that be pretty? He was so into it and started fingering me while wating my ass and I was in heaven. Then it happened... he gets up says I should probably go wash my mouth out and I'm like okay? I thought he wanted to then eat me out because we discussed that he would brush his teeth and mouthwash if he wanted to go down again. So he cums back and I'm like hiii and he starts asking me how was and that it was so hot. Then he says that he went to wash his mouth bec someone went in it and I about died. I was so confused and he kept saying no it wasnt what you think it's not what you think it wasnt poop I'm not sure what it was. So I want to jump off a building and hes trying to calm me down saying it wasnt poop bec it had no taste and he doesnt even know if it was st or not because he was very high and he had stuck his tongue inside me and there was no taste just a changing in texture..?! He kept saying I didnt poop in his mouth and then regretted telling me this he only said it bec it was funny. He kept reassuring me it wasnt and I'm not sure if I belive him. So the question has anything like this happened to someone else? Is there another explanation? My friend thought it could've been accumulation of his saliva and vaginal fluid in my anus that went in his mouth when my butthole relaxed. But ya did this happen to anyone else? (We did end up continuing and even 69 after so I dont think he cared too much but I'm still embarrassed.)