I think your Master will laugh his ass off-

perhaps "punishment" for fun, because well the way I see it you deserve a fun session for having skill we all can only dream of

As for the serious side, I can't fathom he'd be disappointed because it was not intentional.

Scientifically, I'm not surprised your horniness set free with a sneeze... tis why if you've ever had a sneezing fit it's almost orgasmic... so much release takes place in the body during a sneeze!

Do tell him at the right time though- no pulling those stitches out!!!!!!!