Hello there friend. I know how much you love your Master and don't like letting him down but he really must take responsibility for your health and wellbeing. Forcing cock up ass when the muscles are not ready or the anal passage aren't lubricated properly is not a nice or easy experience for anyone.
A Dom should never, ever expect a sub/slave to do anything that is physically beyond her limit without practice. A Dom should NEVER be angry or punish a sub/slave for failing to do something that was beyond her control. My Dom likes anal and so it is both our responsibility to train my ass. But plugs that aren'tnot too big to put in for say 15 minutes at a time while seated or walking around, moving up over the weeks to half an hour. After a couple of weeks you'll find you can use the next size up and so on depending on the size of your Master. A potential weight-lifter can't just go in the gym and lift 50lb straight away. They have to start with 10lb, 15lb, 20lb and so on until their muscles are trained. Well the spynctus is a muscle too - it must be trained.
I think this is something that requires serious discussin with your Master or you are going to get anally hurt and then he won't be going up there for some time darling.
Good luck anyway subpet
xx
RollingC - vanilla is the name for those that are not actively part of the D/s, BDSM Lifestyle, it just means 'the normal', lol but normal is not part of my vocab. If you send me a PM i can give you some links of some good sites and forums for you to check it out further. One of which is mine ;-)
kk