Does the knowledge of what you're about to do excite you?
This is all part of your progress towards working towards an understanding, or perhaps more of a synchronizing, with your feminine-submissive sexuality.
So it makes sense that you're in a more heightened sexual state after learning that in only a few short moments there will be a full load of male ejaculate inside your stomach.
Pleasuring and taking on the seed of men is commonly seen as a submissive trait in many cultures, in fact this tendancy is seen all over the world and in many different species - humans are the only ones who perform the ritual orally, of course, but it's an insightful observation nonetheless.