i had a somewhat similar experience with the ex wife but in reverse i was the one with the fever and not very horny so i ate her pussy till she orgasmed and was ready to go to sleep and rest after that... she looks at me and says i was really hoping to have sex tonight... well a fever increases stamina for some reason... I had to spank her and pull her hair to to cum...Alright then, time to overshare again...
A couple of years ago when I was in a committed relationship my girlfriend had a bad cold with a really high fever. We still had sex because we loved each other very much. She felt so warm inside, when I put it inside of her it kind of felt like wrapping a heating blanket around it. Not sure how to explain it but it felt really special and was a huge turn on.