One or two things – Most of the time a girl from work who makes me hard just by being in the same room.
Just now being aroused and needing a bowel movement.
It has been raining all day so I have stopped indoors and spent the last couple of hours surfing fap. Most of the time I have been fairly aroused and erect. I am wearing girls gym knickers, burgundy in colour, full and tight, but not too tight. They feel damp, not that I have wet myself so it must be that I have been leaking precum.
It would not have mattered if I had wet myself as over my gym knickers I am wearing two pairs of double terry towelling very full nappy knickers and plastic pants. I put them on as a precaution as before I sat down in my comfy chair in front of the computer I slipped a glycerine suppository into my anus. I have not had a bowel movement for a couple of days so I am fairly full. The single laxative has been constantly reminding me of that. Only one suppository is not usually enough to cause loss of control. Maybe later I will slip some more into my bottom.
So I have been surfing imagefap, looking out for interesting subject matter – sissies, in sheer panties or nappies - young girls, not too young, but young enough to be virgins ready for their first time – mothers who want to help their daughters in their transition from maiden to woman.
So that is why I have been masturbating, not with my hand but by squeezing my thighs together as much as my bulky nappy lets me and by rotating my pelvis so that my penis slides inside my knickers. The induced need to have a poo has also added to my arousal as to control it I have had to use my pelvic floor and sphincter muscles.
Each time I find a particularly erotic image I stroke my nipples. Although it never really fully subsides being erect and aroused certainly suppresses the urge to poo. I could have easily cum in my knickers quite a few times but I have deliberately stopped masturbating short of the point of no return.
Once or twice I must admit I have been distracted away from fap by thoughts of that girl from work.
