Feel a little guilty
I am 16 and I have had a crush on my step father since before my mom married him. She is a nurse and works 3-11 at a hospital, so I would tease my step dad each evening she was at work, walking around in my underwear, sitting in a shirt and panties with a wet spot on my panties, to finally sitting in just a short nightgown with no panties on, sitting so he could see my pussy, he finally got the hint, now when mom is at work we are fucking. I do feel guilty that my step dad is cheating on my mom with me, but the sex is so good.
My girlfriend said she fantasizes about her step dad. She said she would be open to it if everyone was into it. We know her mom definitely wouldnt be into it. But the idea is intriguing. We love the idea so much and from things she's told me we have a pretty good idea he wants to fuck her too. She just won't unless her mom is okay with it.
Please do not feel guilty.
You'll eventually fall for a guy closer to your age; and you'll be out of the house for university or whatever in about 2 years.