Yes, I would totally do this. I say ‘would’ because I have never done it with a consenting adult partner before, but I know that I'd be up for it with the right person. As I get more comfortable with myself, I don't mind admitting it. I'm a ‘big kid’ in a lot of ways, some of it completely non-sexual and simply down to personality and a strong connection with my childhood, and how I'm actually regarded as a serious and ‘professional’ person in my every day life with quite a good job and a lot of people who hold me in high regard as an adult, but at heart and at home I'm very much a ‘big kid’ and I like stepping out of my work-space and into kid-me headspace when I get in the door at home. The medical part does centre around how I developed that side of me, because I like connecting to early experiences, and they were also my early experiences of being aroused and discovering what a ‘turn on’ is.
I've explored this side of me in fantasies where I've just enjoyed the results alone many times, and also in fiction, for my own pleasure I've written medfet stories. But with a consenting partner who could role-play a good doctor I know I'd really enjoy playing a little leaning towards middle (9-12 years) or a middle teenager aged 13-16/17. My favourite thing is stethoscopes and auscultation, so I'd love any role play involving the doctor listening to my chest, and someone playing Mom or Dad would be seriously cool to me. I think my favourite thing is when I'm the co-operative patient who really enjoys everything, and the parent-player thinks its cute and praises-rewards me for my good behaviour. But equally I'm more than capable of being a very accomplished brat. I posted in another topic about how one time when I was sick I really didn't want to co-operate with a real doctor and was grouchy and bratty and cried a little bit because I was uncomfortable, but in the end I let everything happen because somehow I liked it on some level, and I could totally play that as a role too.
I think I'd quite enjoy being a doctor to an adult partner who liked role-playing a kid, if only because they might give me ideas about how to improve my own role-play, but also because in real life I'm quite a kind person who's prepared to be patient with people even if doesn't come naturally, and even though I'm not paternal I'm actually not bad with kids and would likely be quite good in the role-model/professional role if it was an age-play thing, but at heart I think I'm the kid in most age-play scnenarios.
I think the 9-12 role is my favourite thing, but equally I have a lot of unfulfilled fantasy as a teen when I really didn't get examined much in real life at all, and would really enjoy this. I think I'd quite like starting off with a parent-figure in the room for some of it and then having them step out so I could talk to the doctor ‘in confidence’ on my own and go for the trouble maker side of me, with stuff like ‘So Alex, now your Mom/Dad's not here, I want you to know that everything you say in here stays between us and I'm not allowed to tell anyone' and then the doctor persuades me to tell the truth about stuff like ‘Are you sexually active at the moment?’ and then maybe gets me to admit that I have a boyfriend rather than a girlfriend but my parents don't know yet, and ‘So Alex, do you smoke at all? It’s okay you can tell me and I won't judge you.' (I did smoke as a teen and I never would have admitted it to a doctor, but role-play me would totally enjoy doing that!) Maybe even ‘Any drug use at all? Don’t worry, you can't get in trouble for it because I'm not allowed to tell anyone unless you're a danger to yourself' and I admit to how I occasionally smoked pot too. For someone who was quite loyal to their parents as a real-life middle, I actually was quite naughty in many ways. I even think ‘So Alex, how much video games do you play every week?’ might come into it as I might have been leaning towards spending too much time sat on my arse and not always looking after my health was totally a thing despite wanting to be a healthy kid because I liked medical exams and wanted a doctor to be impressed with me.