This song is from a game called, Nora to Oujo to Noraneko Heart.
It is a wonderful Visual Novel which features Comedy, Romance, and a bit of Drama. It's a very fun and interesting read. 
This song is specifically from a H scene.

Noraneko「しずく」ノラと皇女と野良猫ハート

「ノラと皇女と野良猫ハート」主題歌の「野良猫ハート」をヒロインの4人全員で合唱してもらいました。(パート分けなし）

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