Potchari jukujo: Senzaki Haruka, Yasuoka Tamaki (KBKD-482), released in August 2009 by Kobayashi Enterprises. It appears to be similar in format to the same studio's Tamaki co-starring Chubby MILFs: Narumi Mori, Tamaki (KBKD-534; June 2009) which I reviewed here in a two-part post on May 13, and May 14, 2013.
|Haruka Senzaki (L) and Tamaki Yasuoka (R) in KBKD-482|
Tamaki-san gets a chance to do that cow-girl boob-bounce that I like so much. The concept of slow-motion was created for scenes like this.