So both of us had come home tired after a long travel. We wanted to get into it but were too tired, told each other we will wake each other if one of us woke up in the middle of night, to have sex. And we both fell asleep naked. Middle of the night, I wake up to my wife’s hands all over me. Getting excited, I too joined in the fun. Both of us, were in a groggy state. In a quick while, without much foreplay I had my mouth on her vagina. In about 5 - 10 minutes she began to moan and had an orgasm. From her expressions, I could make out she was having an exceptionally good time. Post-nut she pulled me up. But before we could do anything else she got spooked by something. She kept saying she felt there was a ghost. The mood in the room changed. We switched on the lights and she fell asleep after I reassured there was nobody else.

We wake up in the morning, I ask her what happened. She tells me the cunnilingus was so good, she felt convinced in the night that I had to be possessed because the way I did it was very unlike me and that spooked her out of the mood. Now I know my wife, she was really telling the truth. And now we are sitting laughing about it: how it couldn’t have been me when the action was that good. Now that she’s convinced that it was just me in my groggy state, she keeps asking how I did it.

TL:DR - I gave a cunnilingus so good when both of us were half asleep, wife was so convinced that it should have been a ghost that possessed me, which made me that good.