Two partners with a large height difference, basically. I associate it more with realistic heights, and maybe mini-giantess. Any larger and I think it would be referred to as micro/macro.

tierynbe:

A continuation of this earlier post

“Ooooh, you’ve gotten good at this,” she moaned as he worked his magic between her thighs as she stood. She loved that she was tall enough–and dominant enough–to do this with her boyfriend. Not only that she could just push him onto his knees to have him eat her out, but the fact that he so easily submitted to it… the thought was almost enough to make her climax right there. “I think it’s about time we test out my newest toy, though,” she purred, pulling him back towards their bed with her. Laying on her back with him on top of her, she flipped the pair over and pulled his slacks off, freeing the “toy” in question: her boyfriend’s nearly-two-foot cock. She grinned wickedly as she ran her hands up and down his length, preparing him for plunging into her…