"Actually," said Haley, "I have a bit of a weird, kinky fetish, but I never thought I would be able to realize it."
You lean in, curious. "So what is it? You can tell me, I promise not to spill it to anyone else."
Haley blushes. "Well, my fetish is for another person to become a part of my body. To be absorbed into me, with their consciousness confined to a piece of my anatomy, while still keeping all of their senses. Weird, I know, but it really turns me on."
You ponder for a minute. "Maybe... I can help? Like, I could use the ring to make myself a part of you?"
Haley's eyes flash. "You would do that? For me?"
"Why not? I can use the ring to set a time limit on it so I turn back, in case I really hate being part of you. And if I do like it, I can find a way to make it permanent. There's no harm in trying. Plus, to be honest, it does sound kinda hot."
"Wow, you're the best! First, I want you to become..."