https://www.dlsite.com/maniax/work/=/product_id/RJ01034868.html

Part 1 of (currently) 3

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The title translates to something like "The Girl I Like is a Penis-Refresher."
Even though Okada could have used a different penis-refresher, he waited until Takahashi was on duty and ends up accidentally confessing. She can't go out with him since she already has a boyfriend, but she'll gladly help him pop his cherry.

(同人誌) [イョキロー] 僕の好きな女の子はオチンチンすっきり係 (オリジナル) [DL版]

Base +6, Nano234 +2, Coledas Ukgent +12