https://www.dlsite.com/maniax/work/=/product_id/RJ01644040.html

The protagonist, suffering from premature ejaculation and masochistic tendencies, was always defeated by the monster girls that appeared in the dungeon.
By chance, he stumbles upon a sign that reads “Angel Clinic, Specializing in Premature Ejaculation Treatment.”
At the clinic, he meets Sera, a self-proclaimed angelic nurse with a poker face. Her proposed treatment for premature ejaculation involves enduring her seduction and becoming accustomed to sexual encounters. Confused, he undergoes the treatment, but as expected, he can’t resist Sera’s seductive tactics and reveals his pathetic side.
However, from her expressionless mouth come a series of affectionate words such as “cute” and “I love you”…

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