If you're a woman looking for technique advice, if you have large breasts, I'd say watch Gianna Michaels videos. Not only is she hot and busty as fuck, but she is a titfuck wizard; she truly understands what men actual like and knows how to use her tits. Her alternating shake move during titfucks is a master play (but don't overdo it, it should be occasional and used to provide variety to the stimulation, not as a main feature).