(Editor note: I kind of wrote this as an ending to the series, but I like the characters. Might make more with these characters later.)
A few months later...
Things have changed a bit since that night a few months ago. When Emily And Sarah broke up and Sarah joined into a relationship with myself and Ellen, the house really changed. I had not had sex with Ellen's mom Maria or her sister Emily ever since. None of us have. Our relationship stayed internal, I feel it's because we had everything we needed.
Emily's experimenting was just beginning though. Every other week it felt like Emily had a new boyfriend. This week she was with a guy named Oliver. I could hear Emily almost screaming in pain when they had sex. It didn't take long to find out why. Olive walked from Emily's room to the washroom and I was walking past. Oliver was naked and along with that his monster 12 inch cock. I won't lie, it was quite impressive. I don't even know how someone as small as Emily could take something like that.
A few days later I went to Maria's room to talk to her about something. I get to the door and hear Emily inside.
"Come on mom, take his massive cock" Emily said. I cracked the door open to see inside.
"If I pushed you kids out he can push that thing in" Maria said.
I saw Oliver's massive cock half way inside Maria. Emily was lying next to her rubbing her mothers clit. Emily started to kiss her mom, still rubbing her clit.
"Give her more." Emilys said to Oliver, still kissing her mother to keep her screams and moans down.
"I'll give her all she can take" Oliver said fucking her a couple inches deeper.
"Okay Now do me!" Emily said, shifting her body around and opening her legs.
"I think Maria still wants more." Oliver said, ignoring Emily.
"I want all of you Oliver!" Maria said, holding her legs open. "Keep fucking me until you cum. Give Emily a new sister!"
"I'm going to impregnate the fuck out of you" Oliver said.
Emily, fading into the background of them having sex, got up and left the room. I quickly tried to move but tripped over myself. I leaned against the wall, trying to act inconspicuous. Emily opened the door and closed it behind her, looking up at me.
"I think my boyfriend just left me for mom?" Emily said very confused.
"I mean, maybe he's just following the rules?" I said, trying to help.
"But I never told him anything. He just asked if mom was down to fuck. I knew she would be and thought it would be fun so I said yes. But I think he just wants to actually be with her." Emily said, putting her head down and walking down the hall.
Turns out Emily was right. Oliver did want to be in a relationship with her mom. Just like with Sarah, Emily seemed unfazed and didn't care if they were together. Oliver and Maria started dating immediately. Maria explained to him the old house rules, but they didn't really apply anymore because no one really has sex with anyone they aren't in a relationship with. But it did happen once.