I've actually spent some time thinking about this because it's a niche that walks such a fine line between fantasy and real-world ick factor. Safe ideas usually revolve around the symbolism, not the literal act.
One route is the psychic or dreamscape vore. The 'consumption' happens in a shared mental space or during magical sleep. It's all about the transfer of essence, life force, or memories. Think of it like a supernatural hug that's way too tight, where Character A absorbs Character B's strength or pain to heal them, leaving the physical body untouched but emotionally drained or euphoric afterwards.
Another angle is the 'willing sacrifice in a safe simulation' setup. A high-tech virtual reality where sensations are real but the stakes aren't. This lets you explore the power exchange and the intimacy of complete surrender—the trust of letting someone 'unmake' you in a space with a guaranteed reset button. The tension comes from the emotional aftermath in the real world, not the act itself.
You could also lean heavily into shapeshifter lore. A werewolf or dragon partner carefully, reverently holding their lover in their mouth without breaking skin, the threat of teeth against skin symbolizing absolute trust and the thrill of controlled danger. The focus shifts to the warm breath, the pulse against the tongue, the terrifying/cherishing proximity, and the gentle release. It becomes a ritual of devotion, not digestion. I find stories that emphasize the careful aftercare, the cuddling and checking-in once the intense scene is over, really cement that sense of safety even within the extreme fantasy.