https://www.dlsite.com/books/work/=/product_id/BJ241363.html
https://www.dlsite.com/books/work/=/product_id/BJ307750.html [English]
https://coolmic.me/titles/1399 (English)
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I Shouldn't Cum At The Doctor's! My Father-In-Law Explores The Deepest Part Of Me

"This is a woman's most precious place, so I'll take my time and thoroughly examine it." Even though this is just an examination… If you examine my most sensitive place so thoroughly, I'll cum…!
The daughter of a small clinic's doctor, Ami, suddenly gets asked to do a marriage interview. The two who arrive for the interview end up being her kind future husband and her future father-in-law, a first-rate doctor with a mysterious aura.
One day, her mother-in-law pushes her to get a pre-marital health check...but the doctor set to examine her ends up being her father-in-law?! Just as she convinces herself it's silly to be so wary of receiving such first class medical service and allows the examination to go on, she feels a strange sensation down there…?!
While Ami's view of what's happening is hidden behind a curtain, her body and even insides get covered in lotion, fondled, and licked all over…!
(I can't let out this kind of voice during an examination with my father-in-law…!)