As I peered through the open doorway I finally saw what she was doing, but what I saw was way beyond anything I could expect. I found out that Amelia wasn't human, she was a lamia.
Looking better, I realized that besides her lower body being a snake's, she was stroking her own cock.
I was so surprised I didn't even realize how much I'd leaned over the door until it opened completely, causing me to fall into that room, taking Amelia by surprise.
"What are you doing here Liz? You were not supposed to find this room." she said
"I knew you were hiding something from me, though I didn't imagine any of it." I said pointing to her snake part (that easily reached 15 feet in length) and her dick."What happened to make you look like this? Was it some kind of witchcraft? Any curses? Mutation? were you used as a guinea pig in some experiment?...." I started to ask, since after the initial shock I started to get curious, until interrupted by her
"It's nothing like that, this is my true form since I hatched, I'm what you call a monster." she said
"But you could have told me, we're friends, aren't we? Or did you intend to eat me when you had the opportunity?" I asked
"But no way would I do something like that, this is a lie invented by people who wanted an excuse to end half-human species." she said
"And did you think I would turn you over to be killed if I knew the truth? This way you offend me." I said
"I wanted to tell, since we became friends in elementary school. My mom kept telling you to tell you, but I was afraid you would be afraid of me. And it just got worse as we got older and I started falling in love with you." she said
"And how do you do to hide all this? I've seen you naked in the locker room several times and always seemed perfectly human to me." I asked
"It is thanks to a spell and allows us to assume the human form temporarily. I could only start going to school after I mastered the spell, and you were my first friend." she said
"But I slept in your house several times, couldn't have woken up in the middle of the night and see everything." she said
"You couldn't. You must remember that you never woke up before me, this is because I had to put a spell on you that would keep you sleeping until I canceled it." she said
"So every time you left me alone were you supposed to come jacking off thinking about me?" I asked, she just blushed and nodded confirming. I moved closer to her, lay on her snake part and grabbed her dick saying "Your dick is really big. What's the measure?"
"It's 10 inches erect, especially when I imagine you sucking it." she said
"Sucking like this?" I said and started sucking her dick. She was surprised by that and said I didn't need to do this, and I said I wanted to do this.
While I was giving her a blowjob, Amelia wrapped her tail around me. And while stroking her balls, I found her vagina behind it and put two fingers in it.
Amelia was already so on edge she immediately came. It was too much cum for me to swallow, so I let her cover me with her seed.
After the orgasm she released me, and I got up saying "I think I'll need some clothes from you, I should have taken mine before." and we both laughed a lot