My cousin is six years younger than me. When I was 13 and he was seven he came to stay with us because his family was having some troubles. We got along okay despite the disparity in age. One afternoon we were playing cards and he told he didn't feel well. He thought he might have a fever. I offered to check his temp. Here I was playing the big brother. I had no idea how he preferred to have it done and didn't really care. He told he took it in the tush. So I got a rectal thermometer from the bathroom. When I presented to him he hemmed and hawed and said maybe it was time to take it in the mouth. No problem, I said, and retrieved the oral version.
No, he said, now, back to rectal.
Well, long story short, I got it into him. He seemed not to mind and while it wasn't a turn-on for me, it was still interesting to take someone else's rectal temp.
Turned out he was sick. I took his temp a few times in the ensuing days--my mom did the rest.
Then one night *his* mom, my aunt, came by. One reason he was staying with us was that she had experienced severe depression and had to be hospitalized. So this night she was on furlough. She came into my room wearing hotpants. Nothing really strange about this, now. It was 1971 and every woman under forty tried hotpants. They were mostly more modest than miniskirts. Furthermore it was almost standard in the hospital where she was for women suffering depression to arrive wearing robes and gradually, as the drugs kicked in and psychotherapy worked, to wear nicer clothes, and in the case of younger ones, shorter clothes as their moods improved (I had seen this firsthand because I'd spent time there earlier that year for my "marijuana addiction").
After she greeted me, she sat with my cousin and when it came time to check his temp, she did the honors. I can still see here, sitting by the side of his bed in her hotpants puting the thermometer in while telling him how much she loved taking his temperature because he had such a "cute tushie".
Day or so later my mom took him to the family doctor and I heard that the medical assistant had criticized him for preferring rectal temps, saying "big boys didn't have it taken that way."
I honestly came to respect him for speaking out his preference. I never would have done that.
In fact the only time I was in the hospital myself was for an infection in my leg. This was two years earlier. And, first thing an NA came into my room and asked if I wanted my temp in the mouth or the butt. Of course I said mouth. Pity.
Anyway, unlike some of these "hottie aunt who jerked me off with an enema tube in my butt while my hottie girl cousins watched!" this is a true account and certainly the stuff of later fantasy;-)