I'm ually attracted to my foster father?

Ok so i've recently moved to new supported accommodation and there's a happily married couple, thing is everytime i see him i just wanna grab him and have with him. I know i can't coz i'm not the kinda girl to wreck relationships as i wouldnt like it done to me but i find myself daydreaming about him all the time, thinking up really ual hot scenes between him and me and i melt everytime he looks at me. It's breathtaking. He's in his 40's but to me thats not a problem as i have always gone for older guys and i'am 19, so over the consenting age, but i really really want this man in my bed with me. Advice please, and if you're only going to leave spiteful comments then please don't bother at all