A FB of mine & I are into roleplay - cops, prisoners, handcuffs, etc. We arranged to meet once and he said I was going to have my cock locked in a chastity cage for a few weeks until we met again.
We met in London, he cuffed me, took my trousers down and did a cavity search. He edged me and made me suck him off. Eventually I made him cum and as a reward, he went behind me, pulled my pants up and started to wank me off, his other hand playing with my nipple. He egged me on talking dirty in my ear and urged me to have one last orgasm. As I got close, I asked if I was allowed to cum and he wanked me more vigorously granting me an ejaculation. I shot a huge load in my pants as he continued to work my shaft under the cotton.
Finally I was spent. He then pulled my pants down and started to lock my spunk-covered cock in the chastity cage, pulled up my trousers and then uncuffed me. We made out for a bit then left to get on the tube. He and I were grinning like naughty school boys at each other and he then discreetly gestured towards a guy who was sitting near who seemed to notice us. My mate then leant in towards me and said "I can smell your cum from here and I think that guy can too". He was right, I had noticed that the odour from the spunk in my pants was very noticeable and it felt really slutty.
He got off before me on the tube and whispered "See you in a couple of weeks, you cum slut", kissed me then left. I was locked for two weeks before we met again. I had to show him my locked cock every night and we recounted how dirty it was for him to make me cum in my pants then get on public transport.