The scene was on Diabolic Pop Shots #1 at the 37 min mark and was filmed outside with a pool in the background. A list of films that contributed to the pop shots in the closing credits are as follows:

Gangbang Auditions #1, #3
Down The Hatch #1, #3
Lewd Conduct #1, #3, #5
Panochitas #1, #3, #5
Debauchery #3
2 on 1 #1, #3, #5
POV #1
Un-Natural Sex #1, #3

Thanks.

[Link]