My girlfriend and I were in bed last night. A while back while we were in 69, I stuck my finger in her azz and she had a tremendous orgasm so it's become routine that I do this. Well, last night when I slid my finger in, I felt something that I wasn't expecting. That's right, it felt like she wasn't far away from needing a trip to bathroom. I lost my erection immediately. She became quite upset, saying that I didn't want her, etc. I said I was having trouble breathing with her on top of me, and tried to pick up from there. She would have none of that, rolled over and went to sleep. This morning it became clear she wasn't buying my explanation as she began asking questions about why I lost interest so suddenly. I feel like if I am honest with her she will never let me do that again out of embarrassment and I hate to have limitations in the bedroom. What should I do, should I just tell her flat out that it's hard to stay in the mood when you are fingering schit or stick with my story as it is.