Videos in which one girl is fingering her lover, and clearly going for g-spot stimulation. I think Rayveness is someone who does this fairly consistently. Even better, when she herself is getting fingered she sometimes asks her lover to curve her finger up to hit her g-spot. It's hot!
Example:
https://www.pornhub.com/view_video.php?viewkey=ph557b3fa12805a
Example:
https://www.pornhub.com/view_video.php?viewkey=ph557b3fa12805a