My Sisters Double Secret Lives That Surprises Me.

I am the last and one for my parents who have 6 children. All of my siblings are all females ranging from 37, 35, 34, 29, 26 and me who will be 20 in a couple of months.
Me and my 35yo sister shared the same birthday which is why we called each other twinie.
I am spoiled rotten by all of my sisters barring none. All of them are now married and moved on except for my oldest sister who is a known lesbian. She lives in an upscale community which is my weekend getaway from i was little. She wears next to nothing around the house in front of me which now started to excite me as i grew much older into adulthood.

Now the sister whom i shared birthday with and i visited my oldest sister for a holiday weekend. When we got there my older sister was wearing only a thong and i noticed my other sister changed and was also in her thong and bra . I acted as if i care zero but i was getting a little excited.

Little did i know that 'twinie' were also a secret lesbian behind close door. Her lover who seem much older than her came by just before night fall and they kissed passionately in front of everyone. I were the only one in the dark.
After that first night my sister's lover left as i got the understanding that she's also a married woman. Now that leaves me and my 2 sisters who then told me garments are not allowed to wear inside the house. They told me i only got away the first night because of ignorance but now the rules apply. I immediately took my clothe off and were a little embarrassed when my cock sprang up like a arrow in a bow.

Then the real surprise hit me when i saw both my sisters fully naked and kissing in front of me. Now that did not do well for my cock that is now fully hard. Weed smoking and lots of drinking now tells the tale of what's really going on inside my sister's place.
A long story short, both my sisters took turn to fuck me for the rest of the weekend.
My older sister does not like cock but she grind herself on me to a massive orgasm while the other one used a huge black dildo to satisfy herself.

It was a massive rush of excitement that entire weekend when i fuck both my sisters who are sexy as hell. No where else this has ever took place except at this upscale address which is called "a secret den".