The school gym storage room after classes, with no one around. While furtively touching myself between the legs, someone tapped me on the shoulder from behind, startling me. 'What were you doing? Huh?' pressed a gym teacher in sweats, not even giving me time to put on my panties before I was pushed down. Masturbation - the tragedy of 16 girls! Initially refused but ended up begging for internal ejaculation!
