god, please IGNORE that appalling advice from dreamerdreaming. do NOT ever use a laxative, the results are always unsatisfactory. you stated yourself you go every morning. just about everyone has a regularity routine. simply schedule the session for that time. of course it can't be fail safe, but we toilet slaves know that. if communication is good with your prospective toilet, establish what would be appropriate to provide encouragement if needed (i.e., small enema with your own golden nectar). toilet slaves are a peculiar lot. we usually have specific needs when serving. for example i would never serve as a toilet to a vegan, their gifts are soft and loose which i find wholly unappetizing and unattractive. i will only serve carnivores as i love the firm, solid meals they provide the slave. others may be the opposite. in fact, i am sure that there are those that would love you to use a laxative. so i withdraw my earlier comment. that would pertain to me alone.
this won't help with the session you already had...but for future toilets i hope it provides some insight into the twisted minds of us toilet slaves.
Am I the only one who finds it amusing that this is called "service"? With a whole bunch of stipulations? Sounds to me like the so-called dominant is serving you. And, dude, seriously: put some clothes on. Most of us come across enough arseholes randomly, without having one shoved in our face when we check the boards.