My cheeky but super kind sister-in-law couldn't see me struggling with my virginity, so she said, ``It's okay if you put on a rubber band,'' and let me have sex with her to get rid of her virginity! - But I didn't know how to adjust, so I shook my hips like an idiot, and the rubber broke inside my vagina! - I thought I was there the whole time, but my sister-in-law felt so good that she realized it halfway through. - But as a result, I had a forbidden continuous vaginal cum shot... I ejaculated so much that my sperm overflowed! - sorry! - Please forgive me because I'm a beginner!