My girlfriend does not like to disengage after , what are the dangers to me?

If she is on top it can take up to 30 minutes to get her to disengage and get up off me after we are done. She is smaller than i am and we fit together in such that even flaccid i won't slip out without her cooperation. I try to be understanding and gentle but there is an eww factor for me and i am worried that i will get used to it and we both fall asleep someday only to wake in the morning to find my corroded, yeasted, dissolved or something. Should i be worrie