You never thought you would find a girlfriend, so when the first girl took an interest in you came along you agreed to do anything for her. Now you are seeing what she really meant by anything.
When your partner suggested you try some bondage to spice things up, you never imaged it would start with 3 weeks of chastity followed by a shibari session ending in free use for all your partner's friends.
At first you just paid her to come over and tease you, then it turned to dressing you up, then to chastity, now she demands not to be paid but to get to peg you anytime you want her over. You never knew you'd like it, but after 5 weeks of being locked,