RKI-045 - The Ultimate Fellatio World: 8 Hours of Non-stop Oral Pleasure by 50 Elite Beauties

It's definitely useful. It collects oral scenes from beautiful actresses at major studios, so you won't have any trouble finding a good moment. Sure, it's inevitable that there are a lot of 'I've seen this before' scenes, but as an oral-focused compilation, it's excellent. When you're struggling to decide who to go with, this one video is a great go-to.