Not a doctor but istg
Rabbits Ejaculate in 3/5 seconds
is like this? (Idr if it's 3 or 5)
i read that already not very alike tho
https://www.mangago.zone/read-manga/hashi_no_xl_saizu/ not a doctor but plot is the same
My bad, must've remembered wrong <.<
Good luck though!
https://www.mangago.zone/read-manga/kimi_wa_kokan_no_mochigusare/
This one I believe
YES ヾ(☆▽☆)
JELP i can't find this bl where like the uke was the semes doctor like sex doctor ig because seme had such a big dick that nobody wanted to fuck him