Unwillingly Bi

My live in GF is 34, hot as can be, natural blonde even on her pussy, beautiful and nice C cups to enjoy. We started off normal enough but we've been together for 6 years now and she insists on taking the domme role. I really don't mind it, and never thought I'd be this into the relationship. I did anything sexually she wanted, many times after spankings,paddlings, or whippings. She puts slave marks on me with india ink, and marks over them whenever she sees them fading a bit. She took me to a domme party, and I was abused by many women, not allowed to cum but fucked many of them, and ate a lot of pussy.

One woman who was even more beautiful than my domme convinced my GF to make us two male slaves play together. I'd never done bisex before, and I had to suck him, and eventually i was tied, bent over a stool and fucked. The slave was really hung, and he was allowed to cum in me. I was hurting, I couldn't close my hole after enough to keep the cum in. He was so big, and I think like me, he wasn't allowed to cum often. He deposited a huge amount of sperm inside me, it was leaking out while he was still shooting more into me. Everyone there applauded and laughed at me. Instead of being allowed to be untied, three more male slaves were allowed to use me.

Now when we go to these parties, I'd usually tied over a bench or stool and fucked or suck cock the whole evening. Everyone calls me cumhole to address me. At the end of the night, one of the male slaves who fucks me is made to suck me till I get the cum. The last two times, I've been dressed in a school girl outfit. As long as my domme likes it I will stay.