Let's move things along.

You play with her tongue, getting it moving along your length, before moving deeper. At first you slowly thrust back to the entrance of her throat, warming her up. Soon you don't have to move at all as she takes the initiative, her head bobbing up and down on your vine. Wow, she was really amazing with that tongue of hers, sliding all over you as she starts to suck in earnest. Even without the delightful sensations playing across your limb, you were getting excited just looking at her beautiful face, cheeks hollowing out on every withdrawal. She seems to have forgotten what you were, probably thinking of her teacher. Soon low moans start to vibrate delightfully up your length as she takes you deeper...

You step up your game, sending your probing roots past the lips of her pussy, tickling the sensitized flesh. She lets out a delightful squeal as you engulf her button in gently swirling threads, like dozens of little tongues. Her hips buck a few times, instinctively trying to complete the penetration before her eyes fly open and she remembers her vow. Her bobbing slows as her concentration wavers. Time to bring her back around. You circle around her tongue, emulating a really intense french kiss as you remind her of her task. At the same time, you twirl two vines around each of her sizable breasts, toying with her hardened nipples as you gently knead the soft mounds. Her eyes roll up, lids fluttering shut from the combination of your oral, mammary, and clitoral ministrations.

It isn't long before her hips are bucking again, desperately seeking what she'd been denied for years as a priestess. You continue to tease her but slow your advances so she has to work twice as hard to maintain the contact. She moans pleadingly, eyes scrunched tight as she bucks into your feather-touch and thrusts out her chest into your soft massage. Her head is bobbing frantically back and forth, trying to get you to reciprocate her desire.

But you are patient. You wait. And you wait. And you wait some more, till she's actually slowing down from exhaustion and begging for release around your plant-meat. You can't understand a word she's saying but the message is clear: she's at her limit. You've kept her hovering for over an hour, so close to blessed release and yet still so far. She'd probably thank you if you took her virginity now...