"Tell me to stop, and I will," Henry promised. Then he slowly and carefully pushed one finger inside Ellie, his eyes almost rolling back at the hot, wet tightness.
"Oh god, you feel amazing," he choked. After a couple of experimental thrusts, he pushed a second finger in alongside the first.
"Can... can I..." His train of thought was interrupted by what he was doing, and he didn't care. If he did nothing else for the rest of his life but touch Ellie this way, he thought it would be a pretty good life. But eventually - though not before he encountered a spot inside her that felt different to the rest - eventually, his mind-train got back on track.