Forbidden New Year's Kiss

I can't hold this in anymore, the way I've been fixated on my mother-in-law's body, it's like a fire I can't put out. It started with that New Year's kiss, me a little drunk and just going for it, pressing my lips against hers in the heat of the moment. She froze at first, then didn't pull away right off, and damn, that surprise in her eyes mixed with something else made my heart pound and my blood rush south. But when I tried to deepen it with my tongue, she backed off, leaving me throbbing with regret and raw desire. That's not all though; I've spied on her through the keyhole a few times, catching glimpses of her naked, and those breasts, God, they're perfect for her age, firm with small, dark brown nipples that haunt my dreams. I don't want to fuck her or anything, just touch those tits, feel their weight in my hands, and cum all over them in a explosive release. The fantasy plays out in my head constantly, me telling her straight up how badly I want to cover her in my load, watching her react maybe with that same spark from the kiss. It's messed up, I know, but the thrill of it, the forbidden edge, makes me ache with every beat of my heart. I imagine her letting me, her breath quickening as I get close, the air thick with our shared heat, and it's all I can do not to act on it. This obsession is eating me alive, a mix of guilt and unquenchable lust that keeps me up at night, stroking myself to the thought of her skin under my fingers.