Kohitsuji Hokaku Keikaku!

Katsutaka and Kazuomi are seniors with a secret hobby: they love watching a pair of younger boys making love. Katsutaka and Kazuomi have fallen completely in love with Yuki and Kaede, and vow to capture them once they enter high school. That awaited day has finally arrived, but will the two seniors be able to reach their goal? And are Kaede and Yuki really who the seniors imagined them to be?

(Source: Storm in Heaven)