Just to share a few:
Kendra Lust and Keiran Lee in Personal Trainers: Session 3 (cum at 28:30)
Esperanza Gomez and Justin Slayer in South Beach Cruisin' 3 (cum at 18:00, 23:30 and 50:00)
- I love this scene. I recall a Reddit AMA with Esperanza where she said something like "the guy came three times like he was in love with me or something".
There are a few guys that do these kinds of scenes relatively frequently. Mike Adriano is kind of famous for busting early, but I've seen Marco Banderas do it too.