We were at a party visiting our friends at their college, when I noticed a large football player talking to and taking particular notice of my then girlfriend.
My ex got me into femdom and being a sub and by this time in our relationship we had explored this dynamic heavily. In fact at the party I was wearing a chastity device put on my by my gf.
Anyways I see my gf flirting back with this big football player and eventually they start to make out and heavily grind on one another at the party. I was so embarrassed cause I knew people at the party but I was also so turned on seeing my gf be a slut for this football player.
Eventually my gf introduced me to the football player and explained the dynamic to him. He was down and we went back to his apartment
When we got back to his place him and my gf started to make out and take off their clothes. I thought I would just be watching but to my surprise my gf ordered me to strip too. The football players cock was so big it was humiliating to have to strip and show my tiny caged cock. My girlfriend than gave me her panties and told me to put them on so I could be a proper sissy slut for the football player