SCOP-517 "Please don't move! It's going to go in, stop it!" Unexpectedly turned into continuous orgasms with deep thrusts while doing sex ed with my favorite sister through intercourse! Scoop on the internal ejaculation that arches like a shrimp!

Unable to bear seeing my classmate mock me for being a virgin, my sister kindly gave me sex ed. I exploded multiple times with her hand and mouth! But my erection wouldn't subside, and my sister's eyes sparkled. 'Just mimic me,' she said gently, 'Don't embarrass yourself during the real thing.' As she rubbed her bare pussy against my bare cock, an accidental insertion happened!!! Before I knew it, I was arching my back in intense orgasm, cumming inside my insatiable sister!