Having gotten all dirty with the fucking Amelia, I asked her to let me take a shower, and she told me to use the 1st floor bathroom because on the 2nd floor the shower was not working. After the shower I left wriggling, not bothering to cover myself with the towel since only we were both in the house.
As I passed the living room I saw that Amelia was there, sitting on the couch waiting for me. I thought I would find her in human form, but she was still in her lamia form. I sat next to her naked, and we spent some time talking more about half-humans, She told me that although they were the largest minority of the population, half-humans were more common than I could imagine, I was also surprised when she said that our teacher was also a half-human, she just didn't tell me what species she was.
As we talked, I realized she was casting a few glances on my naked body, and her dick got hard again. She tried to hide her erection, blushed and apologized to me.
"You do not have to apologize. To tell the truth I also felt like having your cock inside me." I said and kissed her
Amelia broke the kiss saying "What are you doing Liz? This ain't right, we're both girls."
"There is nothing wrong, especially when you have this huge dick." I said grabbing her dick
I then swung her leg over her snake part, and positioned myself over her cock, for it to penetrate me as I sat. It was a little difficult than I expected, but eventually her cock got inside me. We started kissing again and I started moving my waist to help stimulate her.
But before we could finish, the front door opened. It was Silvia, Amelia's mother, who had just arrived home, and caught us having sex in the living room.
"Sorry mom, we'll stop right now." Amelia told her mother
"No, we will not stop." I said and then I spoke to Silvia "You have to apologize for that Silvia, but now that we start we are going to the end."
"You can go on, don't worry about my presence here." Silvia said and sat on the other couch and watched Amelia fucking me. Not only did she watch for a long time, she got up and took off her pants and panties, leaving her pussy perfectly in sight. As she sat down again she made a drawing in the air with her finger and her cock grew.
Silvia's dick was as big as Amelia's, and while Amelia fucked me, she masturbated.
It didn't take long for Amelia and I to come. Amelia tried to pull it off, but I hugged her tightly so she couldn't get her cock out of me before she finished coming. Amelia tried to pull it off, but I hugged her tightly so she couldn't get her cock out of me before she finished coming, aiming so that her cum hit her own face. I got off Amelia and sat next to her in time to see clearly the end of Silvia's orgasm.
After a while in silence Silvia said "Liz, I'm impressed, I knew you were trustworthy and I always encouraged Amelia to tell you our secret, but I never imagined you would be so intimate when she told you."
"But I didn't tell her mom, she met me downstairs." Amelia said
Then?