I am now the step mother of a 15 year old, how should I approach this situation?

AliceInWonderLand93
I am engaged to his father who is 33, I moved in about 3 weeks ago. His son is 15years old and lives with us Monday-Friday and goes to his mother's house on weekends. At first he was very awkward and shy around me and didn't really talk much. We we would go to bed he would hug and kiss his father goodnight and just wave at me and say night. One day my fiancΓ© had to work and I was gonna be home all day with him, I thought to myself this is perfect for bonding. I told him that we were gonna hangout and fun and he said ok. We went out to breakfast at Dennys and afterwards went to an amusement park, then back home. He was a lot more talkative this time and laughing and having a good time with me. He then ask me if he could call me mom and I felt so good inside and said of course! We got home and he wanted to go into the pool with me so I went to change into my bikini. When I walked out his eyes lit up as if he's never seen a woman in a bikini before, he said that I looked great and my ass is unbelievable lol so we got into pool and played around and splashed each other and etc... finally I got out and just wanted to tan. His birthday is coming up and I've been wondering what to get him, his dad however told me what he wants and he said all he wants is a night with me! I was fucken shocked! He said he was still a virgin and he has a huge crush on me and he wants me to be his first! His dad said he was ok with it he would rather have me do the honors other then some hooker! His birthday is on Saturday and he wants his present tomorrow night. I told him I would think about it, this is so fucked up I feel so wrong but at the same time I'm not his real mother so? What should I do?

Thanks for an suggestions and thank you all for reading this
I am now the step mother of a 15 year old, how should I approach this situation?
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