Okuchi no Ishi wa Shojo Danshi

Tsubasa met a hot guy named Sakura at a party and went to a love hotel with him, but he was actually a virgin! Tsubasa was so attracted to his cute innocence that she ended up taking him anyway. But they never exchanged contact information and she thought they'll never see each other again... until she happened to visit a dentist and found him there!

(Source: Shueisha, translated)