Caught Between Love and Temptation...

I'm stuck in a delicate web of passion and guilt. My lover is my former student who's now 18+, but we're both aware this isn't typical. The other day, as I was grading papers at home, she walked into the room half-naked, her eyes locking with mine... our connection palpable. She slipped between me and the desk, pressing against me... her lips on my neck, hands slipping under my shirt... our bodies aligning perfectly... skin to skin, breath to breath... her fingers finding their way inside me, curling deeply... I wanted so badly to take it further but stopped just short of crossing that line. Is this something others have dealt with? Is it normal to feel such a powerful pull yet still respect boundaries? It's driving me crazy.